http://www.rssboard.org/rss-specification 720 https://escholarship.org/uc/lbnl_ps_py/rss Recent eScholarship items from Physics Fri, 16 Oct 2026 14:41:56 +0000 https://escholarship.org/uc/item/5h47s68n Using the first spectroscopic data release from the Dark Energy Spectroscopic Instrument (DESI DR1), we conduct the largest systematic search for active galactic nuclei (AGN) signatures in ≈1.7 million low-redshift (0.001 ≤ z ≤ 0.45) line-emitting galaxies. Based on the [N ii]/Hα versus [O iii]/Hβ emission-line ratio diagnostic, we identify AGN in 314,245/1,211,573 (25.9%) high-mass ( log(M⋆/M⊙)&gt;9.5 ) and 9648/467,214 (2.1%) dwarf ( log(M⋆/M⊙)≤9.5 ) galaxies. The AGN fraction in line-emitting galaxies increases monotonically with stellar mass, from ∼1.4% at the low-mass end to ∼93.3% at the high-mass end. Among these AGN, 17,949 exhibit broad Hα emission (BL-AGN), which we use to estimate their black hole (BH) masses via single-epoch virial methods. Leveraging this large BL-AGN sample, we extend the MBH − M⋆ scaling relation down to log(M⋆/M⊙)≈7.8 and log(MBH/M⊙)≈4.4 . We find a bimodal distribution of galaxies in this space, characterized by two distinct empirical relations.... https://escholarship.org/uc/item/5h47s68n Thu, 15 Oct 2026 00:00:00 +0000 Pucha, Ragadeepika Juneau, Stéphanie Mezcua, M Dey, Arjun Mao, Y-Y Alexander, DM Circosta, C Fawcett, VA Guo, Wei-Jian Moustakas, J Panda, S Siudek, M Yu, Zhefu Aguilar, J Ahlen, S Bianchi, D Brooks, D Claybaugh, T https://orcid.org/0000-0002-5024-6987 Dawson, KS de la Macorra, A Doel, P Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, Satya Gontcho A Gutierrez, G Hahn, C Honscheid, K Joyce, R Kehoe, R Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Manera, M Meisner, A Miquel, R Nadathur, S Percival, WJ Prada, F Pérez-Ràfols, I Rossi, G Sanchez, E Schlegel, D https://orcid.org/0000-0002-5042-5088 Schubnell, M Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Weaver, BA Zou, H https://escholarship.org/uc/item/9dq620rc The first observation of a new meson state decaying into and a photon is presented using a dataset of collisions at a center-of-mass energy collected by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of . The mesons are reconstructed from a three-muon final state from decays, along with photons reconstructed via conversions to electron-positron pairs in the detector material. The new state is observed with a significance that exceeds 8 standard deviations. The mass difference between the new meson state and the ground-state meson is measured to be . This corresponds to a mass for the observed state of , where the last uncertainty is due to the precision of the best knowledge of the meson mass. The low mass difference value matches the theory expectations for the lowest vector state of the system, the meson. https://escholarship.org/uc/item/9dq620rc Tue, 13 Oct 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Ackerschott, J Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Coutinho, Y Amaral Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio Apicella, M Appelt, C Apyan, A Arakida, R Arampatzi, M Val, SJ Arbiol Arcangeletti, C https://escholarship.org/uc/item/28t702fk We present a measurement of baryon acoustic oscillations (BAO) in the cross correlation of triply ionized carbon (C iv) absorption with the positions of quasars (QSO) and emission-line galaxies (ELGs). We use quasars and ELGs from the second data release (DR2) of the Dark Energy Spectroscopic Instrument survey. Our data sample consists of 2.5 million quasars, 3.1 million ELGs, and the C iv absorption is measured along the line of sight of 1.5 million high-redshift quasars with z &gt; 1.3. We measure the isotropic BAO signal at 4.2σ for the C IV×QSO cross correlation. This translates into a 3.0% precision measurement of the ratio of the isotropic distance scale, DV, and the sound horizon at the drag epoch, rd, with DV/rd(zeff = 1.92) = 30.3 ± 0.9. We make the first detection of the BAO feature in the C IV×ELG cross-correlation at a significance of 2.5σ and find DV/rd(zeff = 1.47) = 24.6 ± 1.0. https://escholarship.org/uc/item/28t702fk Tue, 13 Oct 2026 00:00:00 +0000 Bault, Abby Cuceu, Andrei https://orcid.org/0000-0002-2169-0595 Guy, Julien https://orcid.org/0000-0001-9822-6793 Aguilar, J Ahlen, S Bianchi, D Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Canning, R Chaussidon, E Claybaugh, T de Belsunce, R de la Macorra, A Dey, Arjun Doel, P Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gordon, C Green, D Gutierrez, G Hahn, C Herrera-Alcantar, HK Honscheid, K Ishak, M Joyce, R Juneau, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kremin, A https://orcid.org/0000-0001-6356-7424 Lamman, C Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Meisner, A Miquel, R Moustakas, J Muñoz-Gutiérrez, A Nadathur, S Palanque-Delabrouille, N Percival, WJ Pieri, Matthew M Poppett, C Prada, F Pérez-Ràfols, I Rossi, G Sanchez, E Schlegel, D https://orcid.org/0000-0002-5042-5088 Seo, H Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Weaver, BA https://escholarship.org/uc/item/0wp07940 This article details two studies of Higgs boson properties using the vector-boson fusion production mode and the γγjj final state. Both efforts are based on a data sample corresponding to 164 fb−1 of s=13.6$$ \sqrt{s}=13.6 $$ TeV proton-proton collisions recorded by the ATLAS experiment at the Large Hadron Collider. The first study employs matrix-element-based optimal observables to constrain CP-odd couplings beyond the Standard Model within the Standard Model Effective Field Theory framework, expressed in the Warsaw basis. The second study exploits angular distributions to probe the Higgs boson’s couplings to longitudinally and transversely polarised W and Z bosons in the production of the Higgs boson. To maximise the sensitivity, the constraints of the CP-odd couplings are combined with those from a previous analysis performed in γγjj events in a data sample of proton-proton collisions at s=13$$ \sqrt{s}=13 $$ TeV, corresponding to an integrated luminosity of 140 fb−1. A significant... https://escholarship.org/uc/item/0wp07940 Tue, 13 Oct 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Aperio Bella, L Apicella, M Appelt, C Apyan, A Arampatzi, M Arbiol Val, SJ https://escholarship.org/uc/item/09b921rg This Letter presents a combination of searches for Higgs boson pair ( ) production performed by the ATLAS and CMS Collaborations using proton-proton collision datasets recorded at during the Large Hadron Collider Run 2, corresponding to integrated luminosities ranging between 126 and . The upper limit at the 95% confidence level on the total signal strength, defined as the ratio of the measured cross section to the standard model (SM) prediction, corresponds to 2.5, with an expected value of 1.7 (2.8) assuming the absence (presence) of the SM signal. The strength of the signal is measured to be relative to the SM prediction. The observed significance is found to be 1.1 standard deviations whereas 1.3 are expected for the SM signal. Constraints are set on the Higgs boson trilinear self-coupling and on the couplings of two Higgs bosons to two vector bosons, both normalized to the SM predictions and denoted as and , respectively. The observed individual constraints at the... https://escholarship.org/uc/item/09b921rg Tue, 13 Oct 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Aitbenchikh, B Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Ambler, A Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Dos Santos, SP Amor Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio https://escholarship.org/uc/item/05s8835b The Lorentz-contracted electromagnetic fields of the ions in ultra-relativistic heavy-ion collisions generate intense quasi-real photon fluxes. These lead to photon-induced interactions that are observed in ultra-peripheral collisions (UPCs), such as vector meson and lepton-pair production. The high photon flux also enables the occurrence of multiple photon-induced processes in a single collision. Presented is the first measurement of the coincident production of γ γ → μ + μ − and γ + A → ρ 0 + A in UPC Pb+Pb collisions at centre-of-mass energies of 5.02 TeV and 5.36 TeV with the ATLAS detector at the Large Hadron Collider. The coincident ρ 0 is identified via its decay into a π + π − pair, with the selected π + π − sample also containing the non-resonant continuum contribution. The rate of the coincident process relative to the exclusive γ γ → μ + μ − process is measured differentially in intervals of forward event activity, quantified by the Zero Degree Calorimeters. The relative... https://escholarship.org/uc/item/05s8835b Tue, 13 Oct 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abulaiti, Y Acharya, BS Ackermann, A Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Aggarwal, A Agheorghiesei, C Ahmadov, F Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Aitbenchikh, B Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JS Allen, JF Allport, PP Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Ambler, A Amelung, C Amerl, M Ames, CG Amezza, T Amidei, D Amini, B Amirie, K Amirkhanov, A Dos Santos, SP Amor Amos, KR Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA https://escholarship.org/uc/item/19m4g9xk We introduce FastPM, a highly scalable approximated particle mesh (PM) N-body solver, which implements the PM scheme enforcing correct linear displacement (1LPT) evolution via modified kick and drift factors. Employing a two-dimensional domain decomposing scheme, FastPM scales extremely well with a very large number of CPUs. In contrast to Comoving-Lagrangian (COLA) approach, we do not require to split the force or track separately the 2LPT solution, reducing the code complexity and memory requirements. We compare FastPM with different number of steps (Ns) and force resolution factor (B) against three benchmarks: halo mass function from friends-of-friends halo finder; halo and dark matter power spectrum; and cross-correlation coefficient (or stochasticity), relative to a high-resolution TreePM simulation. We show that the modified time stepping scheme reduces the halo stochasticity when compared to COLA with the same number of steps and force resolution. While increasing Ns and... https://escholarship.org/uc/item/19m4g9xk Fri, 2 Oct 2026 00:00:00 +0000 Feng, Yu Chu, Man-Yat Seljak, Uroš McDonald, Patrick https://orcid.org/0000-0001-8346-8394 https://escholarship.org/uc/item/9rg0548b A search for dark mesons originating from strongly-coupled, SU(2) dark flavor symmetry conserving models and decaying gaugephobically to pure Standard Model final states containing top and bottom quarks is presented. The search targets fully hadronic final states and final states with exactly one electron or muon and multiple jets. The analyzed data sample corresponds to an integrated luminosity of 140 fb−1 of proton-proton collisions collected at s$$ \sqrt{s} $$ = 13 TeV with the ATLAS detector at the Large Hadron Collider. No significant excess over the Standard Model background expectation is observed and the results are used to set the first direct constraints on this type of model. The two-dimensional signal space of dark pion masses mπD$$ {m}_{\pi_D} $$ and dark rho-meson masses mρD$$ {m}_{\rho_D} $$ is scanned. For mπD/mρD$$ {m}_{\pi_D}/{m}_{\rho_D} $$ = 0.45, dark pions with masses mπD$$ {m}_{\pi_D} $$&lt; 940 GeV are excluded at the 95% CL, while for mπD/mρD$$ {m}_{\pi_D}/{m}_{\rho_D}... https://escholarship.org/uc/item/9rg0548b Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amini, B Amirie, KJ Amor Dos Santos, SP Amos, KR Amperiadou, D An, S Ananiev, V Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C https://escholarship.org/uc/item/9mf0630m Differential cross-sections for top-quark pair production, inclusively and in association with jets, are measured in pp collisions at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC using an integrated luminosity of 140 fb−1. The events are selected with one charged lepton (electron or muon) and at least four jets. The differential cross-sections are presented at particle level as functions of several jet observables, including angular correlations, jet transverse momenta and invariant masses of the jets in the final state, which characterise the kinematics and dynamics of the top-antitop system and the hard QCD radiation in the system with associated jets. The typical precision is 5%–15% for the absolute differential cross-sections and 2%–4% for the normalised differential cross-sections. Next-to-leading-order and next-to-next-to-leading-order QCD predictions are found to provide an adequate description of the rate and shape of the jet-angular observables.... https://escholarship.org/uc/item/9mf0630m Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA https://escholarship.org/uc/item/99v5x374 The ATLAS detector at the LHC recorded 0.49 nb−1 of Pb+Pb collisions and 25 pb−1 of pp collisions, both at the center-of-mass energy 5.02 TeV per nucleon pair. Recently, ATLAS also recorded 3μb−1 of Xe+Xe collisions at the center-of-mass energy 5.44 TeV, which provides a new opportunity to study the system-size dependence of the charged-hadron production in heavy-ion collisions. The large acceptance of the ATLAS detector allows to measure the spectra of charged hadrons in a wide range of pseudorapidity and transverse momentum. The nuclear modification factors R AA are constructed as a ratio of the spectra measured in Pb+Pb or Xe+Xe collisions to that measured in pp collisions. The R AA obtained in the two systems are presented for different centrality intervals and the results are discussed. https://escholarship.org/uc/item/99v5x374 Wed, 30 Sep 2026 00:00:00 +0000 Balek, Petr Collaboration, ATLAS https://escholarship.org/uc/item/92b9d1kq In response to the 2020 Update of the European Strategy for Particle Physics, the Future Circular Collider (FCC) Feasibility Study was launched as an international collaboration hosted by CERN. This report describes the FCC integrated programme, which consists of two stages: an electron-positron collider (FCC-ee) in the first phase, serving as a high-luminosity Higgs, top, and electroweak factory; followed by a proton-proton collider (FCC-hh) at the energy frontier in the second phase. The FCC-ee is designed to operate at four key centre-of-mass energies: the Z pole, the WW pair production threshold, the ZH production peak, and the top/anti-top production threshold—each delivering the highest possible luminosities to four experiments. Over 15 years of operation, FCC-ee will produce more than 6 trillion Z bosons, 200 million WW pairs, nearly 3 million Higgs bosons, and 2 million top anti-top pairs. Precise energy calibration at the Z pole and WW threshold will be achieved through... https://escholarship.org/uc/item/92b9d1kq Wed, 30 Sep 2026 00:00:00 +0000 Benedikt, M Zimmermann, F Auchmann, B Bartmann, W Burnet, JP Carli, C Chancé, A Craievich, P Giovannozzi, M Grojean, C Gutleber, J Hanke, K Henriques, A Janot, P Lourenço, C Mangano, M Otto, T Poole, J Rajagopalan, S Raubenheimer, T Todesco, E Ulrici, L Watson, T Wilkinson, G Abada, A Abbrescia, M Abdolmaleki, H Abidi, SH Abramov, A Adam, C Ady, M Adz̆ić, PR Agapov, I Aguglia, D Ahmed, I Aiba, M Aielli, G Akan, T Akchurin, N Akturk, D Al-Thakeel, M Alberghi, GL Alcaraz Maestre, J Aleksa, M Aleksan, R Alharthi, F Alimena, J Alimenti, A Alioli, S Alix, L Allanach, BC Allwicher, L Altintas, AA Altınlı, M Alviggi, M Ambrosio, G Amhis, Y Amiri, A Ammirabile, G Andeen, T André, KDJ Andrea, J Andreazza, A Andreini, M Andriollo, T Angel, L Angelucci, M Antusch, S Anwar, MN Apolinário, L Apollinari, G Appleby, RB Apresyan, A Apyan, Aram Apyan, Armen Arbey, A Argiento, B Ari, V Arias, S Arias Alonso, B Arnaez, O Arnaldi, R Arneodo, F Arnold, H Arrutia Sota, P Ascioti, ME Assamagan, KA Aumiller, S Aydın, G Azizi, K Azzi, P Bacchetta, N Bacci, A Bai, B Bai, Y Balconi, L Baldinelli, G Balhan, B Ball, AH Ballarino, A https://escholarship.org/uc/item/90c3r1cw Electromagnetic processes, both photon-photon and photon-nucleus, are shown to be useful in studying aspects of QED, QCD, and potentially the QGP. Using lead-lead collisions at s NN = 5.02 TeV , the ATLAS detector has performed measurements of exclusive dimuon production, light-by-light scattering (via exclusive diphoton production), and photo-nuclear dijet production. These are all important examples of ultraperipheral collisions, where the nuclei do not interact hadronically. A recent study of the opening angles of dimuons produced in hadronic heavy-ion collisions, after subtracting heavy-flavor backgrounds, demonstrates that the dimuons carry information correlated with the overlap geometry, potentially about the density of charges in the QGP itself. https://escholarship.org/uc/item/90c3r1cw Wed, 30 Sep 2026 00:00:00 +0000 Steinberg, Peter Collaboration, ATLAS https://escholarship.org/uc/item/8zz686g8 The Image Sources and Credits information section was missing from this article and should have read ‘The FCC Project formally acknowledges and credits all organisations and contributors whose data and imagery form part of the basemaps used in this work. These include © Esri, Airbus DS, FAO, FEMA, GSA, NASA, NGA, NOAA, USGS, CGIAR, NCEAS, Rijkswaterstaat, SITG – State of Geneva (CH), swisstopo, Facebook, Garmin, Geoland, Geodatastyrelsen, Google, Intermap, Maxar, Microsoft, N Robinson, NLS, NMA, OS, Planet, TomTom, as well as © OpenStreetMap contributors, Esri Community Maps contributors, and the GIS User Community. Every effort has been made to correctly acknowledge all data providers and rights holders. Any omission is unintentional, and the FCC Project remains available to review and amend credits upon request from legitimate data owners.’ The original article has been corrected. https://escholarship.org/uc/item/8zz686g8 Wed, 30 Sep 2026 00:00:00 +0000 Benedikt, M Zimmermann, F Auchmann, B Bartmann, W Burnet, JP Carli, C Chancé, A Craievich, P Giovannozzi, M Grojean, C Gutleber, J Hanke, K Henriques, A Janot, P Lourenço, C Mangano, M Otto, T Poole, J Rajagopalan, S Raubenheimer, T Todesco, E Ulrici, L Watson, T Wilkinson, G Abada, A Abbrescia, M Abdolmaleki, H Abidi, SH Abramov, A Adam, C Ady, M Adz̆ić, PR Agapov, I Aguglia, D Ahmed, I Aiba, M Aielli, G Akan, T Akchurin, N Akturk, D Al-Thakeel, M Alberghi, GL Alcaraz Maestre, J Aleksa, M Aleksan, R Alharthi, F Alimena, J Alimenti, A Alioli, S Alix, L Allanach, BC Allwicher, L Altintas, AA Altınlı, M Alviggi, M Ambrosio, G Amhis, Y Amiri, A Ammirabile, G Andeen, T André, KDJ Andrea, J Andreazza, A Andreini, M Andriollo, T Angel, L Angelucci, M Antusch, S Anwar, MN Apolinário, L Apollinari, G Appleby, RB Apresyan, A Apyan, Aram Apyan, Armen Arbey, A Argiento, B Ari, V Arias, S Arias Alonso, B Arnaez, O Arnaldi, R Arneodo, F Arnold, H Arrutia Sota, P Ascioti, ME Assamagan, KA Aumiller, S Aydın, G Azizi, K Azzi, P Bacchetta, N Bacci, A Bai, B Bai, Y Balconi, L Baldinelli, G Balhan, B Ball, AH Ballarino, A https://escholarship.org/uc/item/8z33z49w A search for a new heavy scalar particle X decaying into a Standard Model (SM) Higgs boson and a new singlet scalar particle S is presented. The search uses a proton-proton (pp) collision data sample with an integrated luminosity of 140 fb−1 recorded at a centre-of-mass energy of s$$ \sqrt{s} $$ = 13 TeV with the ATLAS detector at the Large Hadron Collider. The most sensitive mass parameter space is explored in X mass ranging from 500 to 1500 GeV, with the corresponding S mass in the range 200–500 GeV. The search selects events with two hadronically decaying τ-lepton candidates from H → τ+τ− decays and one or two light leptons (ℓ = e, μ) from S → VV (V = W, Z) decays while the remaining V boson decays hadronically or to neutrinos. A multivariate discriminant based on event kinematics is used to separate the signal from the background. No excess is observed beyond the expected SM background and 95% confidence level upper limits between 72 fb and 542 fb are derived on the cross-section... https://escholarship.org/uc/item/8z33z49w Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Adam Bourdarios, C Adamczyk, L Adamek, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA Aperio Bella, L https://escholarship.org/uc/item/8xw4j29k A combination of measurements of the inclusive top-quark pair production cross-section performed by ATLAS and CMS in proton–proton collisions at centre-of-mass energies of 7 and 8 TeV at the LHC is presented. The cross-sections are obtained using top-quark pair decays with an opposite-charge electron–muon pair in the final state and with data corresponding to an integrated luminosity of about 5 fb−1 at s$$ \sqrt{s} $$ = 7 TeV and about 20 fb−1 at s$$ \sqrt{s} $$ = 8 TeV for each experiment. The combined cross-sections are determined to be 178.5 ± 4.7 pb at s$$ \sqrt{s} $$ = 7 TeV and 243.3−5.9+6.0$$ {243.3}_{-5.9}^{+6.0} $$ pb at s$$ \sqrt{s} $$ = 8 TeV with a correlation of 0.41, using a reference top-quark mass value of 172.5 GeV. The ratio of the combined cross-sections is determined to be R8/7 = 1.363 ± 0.032. The combined measured cross-sections and their ratio agree well with theory calculations using several parton distribution function (PDF) sets. The values of the top-quark... https://escholarship.org/uc/item/8xw4j29k Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abbott, DC Abed Abud, A Abeling, K Abhayasinghe, DK Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Abusleme Hoffman, AC Acharya, BS Achkar, B Adam, L Adam Bourdarios, C Adamczyk, L Adamek, L Addepalli, SV Adelman, J Adiguzel, A Adorni, S Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agapopoulou, C Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Aguilar-Saavedra, JA Ahmad, A Ahmadov, F Ahmed, WS Ai, X Aielli, G Aizenberg, I Akatsuka, S Akbiyik, M Åkesson, TPA Akimov, AV Al Khoury, K Alberghi, GL Albert, J Albicocco, P Alconada Verzini, MJ Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Alhroob, M Ali, B Ali, S Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allport, PP Aloisio, A Alonso, F Alpigiani, C Alunno Camelia, E Alvarez Estevez, M Alviggi, MG Amaral Coutinho, Y Ambler, A Ambroz, L Amelung, C Amidei, D Amor Dos Santos, SP Amoroso, S Amrouche, CS Anastopoulos, C Andari, N Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Antrim, DJA Anulli, F Aoki, M Aparisi Pozo, JA Aparo, MA Aperio Bella, L Aranzabal, N Araujo Ferraz, V Arcangeletti, C Arce, ATH Arena, E https://escholarship.org/uc/item/8br8s2cx This paper presents a search for a new Z′ resonance decaying into a pair of dark quarks which hadronise into dark hadrons before promptly decaying back as Standard Model particles. This analysis is based on proton-proton collision data recorded at s$$ \sqrt{s} $$ = 13 TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb−1. After selecting events containing large-radius jets with high track multiplicity, the invariant mass distribution of the two highest-transverse-momentum jets is scanned to look for an excess above a data-driven estimate of the Standard Model multijet background. No significant excess of events is observed and the results are thus used to set 95% confidence-level upper limits on the production cross-section times branching ratio of the Z′ to dark quarks as a function of the Z′ mass for various dark-quark scenarios. https://escholarship.org/uc/item/8br8s2cx Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA https://escholarship.org/uc/item/890370h9 This paper presents differential cross-section measurements of events containing a charged lepton, missing transverse momentum, two b-jets, and two light jets, consistent with the W+W−bb¯$$ {W}^{+}{W}^{-}b\overline{b} $$ final state. The analysis is based on 140 fb−1 of proton-proton collision data at s=13$$ \sqrt{s}=13 $$ TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider (2015–2018). Differential cross-sections are unfolded at particle level for a range of kinematic observables and in three kinematic regions. Both regions and observables are optimised for sensitivity to the interference between W+W−bb¯$$ {W}^{+}{W}^{-}b\overline{b} $$ produced with singly and doubly resonant top quarks. Results are compared with various theoretical predictions and deviations are observed in regions sensitive to the interference between singly and doubly resonant top-quark production. The unfolded results provide new information about the modelling of interference... https://escholarship.org/uc/item/890370h9 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abulaiti, Y Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Allport, PP Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amezza, T Amidei, D Amini, B Amirie, K Amirkhanov, A Amor Dos Santos, SP Amos, KR Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F https://escholarship.org/uc/item/8733j9tn The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,200 new measurements from 903 papers, we list, evaluate, and average measured properties of gauge bosons and the recently discovered Higgs boson, leptons, quarks, mesons, and baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle properties and search limits are listed in Summary Tables. We give numerous tables, figures, formulae, and reviews of topics such as Higgs Boson Physics, Supersymmetry, Grand Unified Theories, Neutrino Mixing, Dark Energy, Dark Matter, Cosmology, Particle Detectors, Colliders, Probability and Statistics. Most of the 118 reviews are updated, including many that are heavily revised. The Review is divided into two volumes. Volume 1 includes the Summary Tables and 96 review articles. Volume 2 consists of the Particle Listings and contains also 22 reviews that address... https://escholarship.org/uc/item/8733j9tn Wed, 30 Sep 2026 00:00:00 +0000 Group, Particle Data Takahashi, F Hikasa, K Sumino, Y Tanabashi, M Tanaka, J Yokoyama, M Agashe, K Aielli, G Allanach, BC Alvarez-Muñiz, J Amsler, C Antonelli, M Aschenauer, EC Asner, DM Assamagan, K Baer, H Banerjee, Sw Barnett, RM https://orcid.org/0000-0002-7210-9887 Baudis, L Bauer, CW https://orcid.org/0000-0001-9820-5810 Beringer, J https://orcid.org/0000-0002-9975-1781 Bettini, A Biebel, O Black, KM Blucher, E Bonventre, R https://orcid.org/0000-0001-6782-9727 Briere, RA Buckley, A Burkert, VD Bychkov, MA Cacciapaglia, G Cahn, RN Canelli, F Cao, J Cao, Z Carena, M Casarosa, G Ceccucci, A Cepeda, M Cerri, A Chivukula, RS https://orcid.org/0000-0002-4142-1077 Cortês, M Cowan, G Crede, V Cremonesi, O D’Ambrosio, G Damour, T Davies, CTH de Blas, J de Florian, D de Gouvêa, A DeGrand, T Demiragli, Z Dittmaier, S Dobrescu, BA D’Onofrio, M Dorigo, M Dreiner, HK Duarte, JM https://orcid.org/0000-0002-5076-7096 Eerola, P Egede, U El-Khadra, AX Ellis, J Eno, SC Erler, J Fava, A Fetscher, W Fields, BD Freitas, A Gallagher, H Gasik, P Gershon, T Gherghetta, T Giovannella, S Gonzalez-Garcia, MC Goodman, M Grab, C Gritsan, AV Grojean, C Groom, DE Grünewald, M Gurtu, A Gutsche, T Haber, HE Hamel, M Hanhart, C Hashimoto, S Hayato, Y Hebecker, A Heinemeyer, S Hernández-Rey, JJ Hertzog, DW Hisano, J Höcker, A Hoferichter, M Hofmann, W Holder, J Hsu, L Huston, J https://escholarship.org/uc/item/802400v0 This Letter presents the first evidence of the simultaneous production of two Z bosons and one photon with the ATLAS detector at the Large Hadron Collider. The measurement is performed using the full Run-2 dataset, recorded from 2015 to 2018, of proton-proton collisions at a center-of-mass energy of 13&nbsp;TeV, corresponding to an integrated luminosity of 140  fb^{-1}. The fully leptonic final state with four leptons and one photon is analyzed, pp→ZZγ→ℓ^{+}ℓ^{-}ℓ^{'+}ℓ^{'-}γ with ℓ,ℓ^{'}=e or μ. This final state is measured in a fiducial region where photon final-state radiation is minimized, and the photon has a transverse momentum of p_{T}^{γ}&gt;20  GeV. Eight events are selected, with a background estimate of 0.92±0.15. This results in an observed (expected) significance of the ZZγ final state of 4.4σ (4.0σ). The measured cross section for pp→ZZγ→ℓ^{+}ℓ^{-}ℓ^{'+}ℓ^{'-}γ in the fiducial region is σ_{ZZγ}=0.144_{-0.051}^{+0.065}(stat)_{-0.004}^{+0.008}(syst)  fb, in agreement... https://escholarship.org/uc/item/802400v0 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Ambler, A Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio Apicella, M Appelt, C Apyan, A Arampatzi, M https://escholarship.org/uc/item/7zs4v2d9 Measurements of Higgs boson production cross-sections are carried out in the diphoton decay channel using 139 fb−1 of pp collision data at s$$ \sqrt{s} $$ = 13 TeV collected by the ATLAS experiment at the LHC. The analysis is based on the definition of 101 distinct signal regions using machine-learning techniques. The inclusive Higgs boson signal strength in the diphoton channel is measured to be 1.04−0.09+0.10$$ {1.04}_{-0.09}^{+0.10} $$. Cross-sections for gluon-gluon fusion, vector-boson fusion, associated production with a W or Z boson, and top associated production processes are reported. An upper limit of 10 times the Standard Model prediction is set for the associated production process of a Higgs boson with a single top quark, which has a unique sensitivity to the sign of the top quark Yukawa coupling. Higgs boson production is further characterized through measurements of Simplified Template Cross-Sections (STXS). In total, cross-sections of 28 STXS regions are measured.... https://escholarship.org/uc/item/7zs4v2d9 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abbott, DC Abeling, K Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Abusleme Hoffman, AC Acharya, BS Achkar, B Adam, L Adam Bourdarios, C Adamczyk, L Adamek, L Addepalli, SV Adelman, J Adiguzel, A Adorni, S Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Aguilar-Saavedra, JA Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Al Khoury, K Alberghi, GL Albert, J Albicocco, P Alconada Verzini, MJ Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Alhroob, M Ali, B Ali, S Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allport, PP Aloisio, A Alonso, F Alpigiani, C Alunno Camelia, E Alvarez Estevez, M Alviggi, MG Amaral Coutinho, Y Ambler, A Amelung, C Ames, CG Amidei, D Amor Dos Santos, SP Amoroso, S Amos, KR Amrouche, CS Ananiev, V Anastopoulos, C Andari, N Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Antrim, DJA Anulli, F Aoki, M Aparisi Pozo, JA Aparo, MA Aperio Bella, L Appelt, C Aranzabal, N Araujo Ferraz, V Arcangeletti, C Arce, ATH Arena, E https://escholarship.org/uc/item/7qd7z6pc Events containing a high transverse momentum (p T) prompt photon offer a useful way to study the dynamics of the hot, dense medium produced in heavy ion collisions. Because photons do not carry color charge, they are unaffected by the medium, and thus provide information about the momentum, direction, and flavor (quark or gluon) of the asso- ciated hard-scattered parton before it begins to shower and become quenched. In particular, the presence of a high-p T photon can be used to select pp and Pb+Pb events with the same configuration before quenching, limiting the effects of quenching-induced selection biases present in other jet measurements. The large statistics pp and Pb+Pb data delivered by the LHC in 2015 allow for a detailed study of photon-tagged jet quenching effects, such as the overall parton energy loss and modified structure of the component of the shower which remains correlated with the initial parton direction (e.g. in cone). In this proceeding, photon-tagged measurements... https://escholarship.org/uc/item/7qd7z6pc Wed, 30 Sep 2026 00:00:00 +0000 Perepelitsa, Dennis V Collaboration, ATLAS https://escholarship.org/uc/item/78b970xq A measurement of novel event shapes quantifying the isotropy of collider events is performed in 140 fb−1 of proton-proton collisions with s$$ \sqrt{s} $$ = 13 TeV centre-of-mass energy recorded with the ATLAS detector at CERN’s Large Hadron Collider. These event shapes are defined as the Wasserstein distance between collider events and isotropic reference geometries. This distance is evaluated by solving optimal transport problems, using the ‘Energy-Mover’s Distance’. Isotropic references with cylindrical and circular symmetries are studied, to probe the symmetries of interest at hadron colliders. The novel event-shape observables defined in this way are infrared- and collinear-safe, have improved dynamic range and have greater sensitivity to isotropic radiation patterns than other event shapes. The measured event-shape variables are corrected for detector effects, and presented in inclusive bins of jet multiplicity and the scalar sum of the two leading jets’ transverse momenta.... https://escholarship.org/uc/item/78b970xq Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abbott, DC Abeling, K Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Abusleme Hoffman, AC Acharya, BS Adam Bourdarios, C Adamczyk, L Adamek, L Addepalli, SV Adelman, J Adiguzel, A Adorni, S Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Aguilar-Saavedra, JA Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Al Khoury, K Alberghi, GL Albert, J Albicocco, P Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Alhroob, M Ali, B Ali, S Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Antrim, DJA Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA Aperio Bella, L Appelt, C Aranzabal, N Araujo Ferraz, V Arcangeletti, C Arce, ATH Arena, E https://escholarship.org/uc/item/7836t7bm A combination of searches for Higgs boson decays into a visible photon and a massless dark photon (H → γγd) is presented using 139 fb−1 of proton-proton collision data at a centre-of-mass energy of s$$ \sqrt{s} $$ = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The observed (expected) 95% confidence level upper limit on the Standard Model Higgs boson decay branching ratio is determined to be B$$ \mathcal{B} $$(H → γγd) &lt; 1.3% (1.5)%. The search is also sensitive to higher-mass Higgs bosons decaying into the same final state. The observed (expected) 95% confidence level limit on the cross-section times branching ratio ranges from 16 fb (20 fb) for mH = 400 GeV to 1.0 fb (1.5 fb) for mH = 3 TeV. Results are also interpreted in the context of a minimal simplified model. https://escholarship.org/uc/item/7836t7bm Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amini, B Amirie, KJ Amor Dos Santos, SP Amos, KR Amperiadou, D An, S Ananiev, V Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C https://escholarship.org/uc/item/7499d8km This Letter reports on the first evidence of inclusive Higgs-boson production at high transverse momentum in the bb[over ¯] final state, reconstructed in a single large-radius jet. The results are based on proton-proton collision data recorded by the ATLAS detector at the Large Hadron Collider at a center-of-mass energies of 13 and 13.6&nbsp;TeV, corresponding to a total integrated luminosity of 301  fb^{-1}. The study profits from the large background suppression provided by the use of a new transformer-based algorithm for jet identification and the sharper mass and transverse momentum, p_{T}, resolution from a dedicated regression model. The yield relative to the standard model prediction for Higgs bosons produced at p_{T} larger than 450&nbsp;GeV is measured to be 1.53±0.27)_{-0.27}^{+0.33}±0.17, where the first uncertainty is statistical, the second is experimental systematic, and the third accounts for theory systematic, corresponding to an observed (expected) significance... https://escholarship.org/uc/item/7499d8km Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio Apicella, M Appelt, C Apyan, A Arampatzi, M Val, SJ Arbiol https://escholarship.org/uc/item/7214h1p4 A bstract : The first measurement of the magnitude of the CKM quark mixing matrix element | V cb | using on-shell W -boson decays is presented. The measurement is made with $$ t\overline{t} $$ t t ¯ events from pp collision data corresponding to an integrated luminosity of 140 fb − 1 at a centre-of-mass... https://escholarship.org/uc/item/7214h1p4 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G https://orcid.org/0000-0002-6665-4934 Aakvaag, E https://orcid.org/0000-0001-7616-1554 Abbott, B https://orcid.org/0000-0002-5888-2734 Abdelhameed, S https://orcid.org/0000-0002-0287-5869 Abeling, K https://orcid.org/0000-0002-1002-1652 Abicht, NJ https://orcid.org/0000-0001-5763-2760 Abidi, SH https://orcid.org/0000-0002-8496-9294 Aboelela, M https://orcid.org/0009-0003-6578-220X Aboulhorma, A https://orcid.org/0000-0002-9987-2292 Abramowicz, H https://orcid.org/0000-0001-5329-6640 Acharya, BS https://orcid.org/0000-0002-8588-9157 Ackermann, A https://orcid.org/0000-0003-4699-7275 Adam Bourdarios, C https://orcid.org/0000-0002-2634-4958 Adamczyk, L https://orcid.org/0000-0002-5859-2075 Addepalli, SV https://orcid.org/0000-0002-2919-6663 Addison, MJ https://orcid.org/0000-0002-8387-3661 Adelman, J https://orcid.org/0000-0002-1041-3496 Adiguzel, A https://orcid.org/0000-0001-6644-0517 Adye, T https://orcid.org/0000-0003-0627-5059 Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y https://orcid.org/0000-0001-8102-356X Agaras, MN https://orcid.org/0000-0002-4355-5589 Aggarwal, A https://orcid.org/0000-0002-1922-2039 Agheorghiesei, C https://orcid.org/0000-0003-3695-1847 Ahmad, A https://orcid.org/0000-0001-8638-0582 Ahmadov, F https://orcid.org/0000-0003-3644-540X Ahuja, S https://orcid.org/0000-0003-4368-9285 Ahuja, S https://orcid.org/0009-0005-5865-8774 Ai, X https://orcid.org/0000-0003-3856-2415 Aielli, G https://orcid.org/0000-0002-0573-8114 Aikot, A https://orcid.org/0000-0001-6578-6890 Ait Tamlihat, M https://orcid.org/0000-0002-1322-4666 Åkesson, TPA https://orcid.org/0000-0003-4141-5408 Akiyama, D https://orcid.org/0000-0001-7623-6421 Akolkar, NN https://orcid.org/0000-0003-3424-2123 Aktas, S https://orcid.org/0000-0002-8250-6501 Alberghi, GL https://orcid.org/0000-0003-2388-987X Albert, J https://orcid.org/0000-0003-0253-2505 Alberti, U https://orcid.org/0009-0006-2568-886X Albicocco, P https://orcid.org/0000-0001-6430-1038 Alderweireldt, S https://orcid.org/0000-0002-8224-7036 Alegria, ZL https://orcid.org/0000-0002-1977-0799 Aleksa, M https://orcid.org/0000-0002-1936-9217 Aleksandrov, IN https://orcid.org/0000-0001-7381-6762 Alexa, C https://orcid.org/0000-0003-0922-7669 Alexopoulos, T https://orcid.org/0000-0002-8977-279X Alfonsi, F https://orcid.org/0000-0002-0966-0211 Algren, M https://orcid.org/0000-0003-1793-1787 Alhroob, M https://orcid.org/0000-0001-7569-7111 Ali, B https://orcid.org/0000-0001-8653-5556 Ali, HMJ https://orcid.org/0000-0002-4507-7349 Ali, S https://orcid.org/0000-0001-5216-3133 Alibocus, SW https://orcid.org/0000-0002-9377-8852 Aliev, M https://orcid.org/0000-0002-9012-3746 Alimonti, G https://orcid.org/0000-0002-7128-9046 Allaire, C https://orcid.org/0000-0003-4745-538X Allbrooke, BMM https://orcid.org/0000-0002-5738-2471 Allen, DR https://orcid.org/0000-0002-9809-2833 Allen, JS https://orcid.org/0000-0001-9398-8158 Allen, JF https://orcid.org/0000-0001-9990-7486 Alley, CS https://orcid.org/0009-0000-0133-6858 Almazan, ER https://orcid.org/0009-0007-6376-7515 Aloisio, A https://orcid.org/0000-0002-3883-6693 Alonso, F https://orcid.org/0000-0001-9431-8156 Alpigiani, C https://orcid.org/0000-0002-7641-5814 Alvarez Fernandez, A https://orcid.org/0000-0003-1525-4620 Alves Cardoso, M https://orcid.org/0000-0002-0042-292X Alviggi, MG https://orcid.org/0000-0003-0026-982X Aly, M https://orcid.org/0000-0003-3043-3715 Amaral Coutinho, Y https://orcid.org/0000-0002-1798-7230 Amelung, C Amerl, M https://orcid.org/0000-0003-1155-7982 Amezza, T https://orcid.org/0009-0008-5694-4752 Amini, B https://orcid.org/0000-0002-4692-0369 Amirie, K https://orcid.org/0000-0002-8029-7347 Amirkhanov, A https://orcid.org/0000-0001-5421-7473 Amperiadou, D https://orcid.org/0000-0003-0205-6887 An, S Anastopoulos, C https://orcid.org/0000-0003-1587-5830 Andeen, T https://orcid.org/0000-0002-4413-871X Anders, JK https://orcid.org/0000-0002-1846-0262 Anderson, AC https://orcid.org/0009-0009-9682-4656 Andreazza, A https://orcid.org/0000-0001-5161-5759 Angelidakis, S https://orcid.org/0000-0002-8274-6118 Angerami, A https://orcid.org/0000-0001-7834-8750 Anisenkov, AV https://orcid.org/0000-0002-7201-5936 Annovi, A https://orcid.org/0000-0002-4649-4398 Antel, C https://orcid.org/0000-0001-9683-0890 Antipov, E https://orcid.org/0000-0002-6678-7665 Antonelli, M https://orcid.org/0000-0002-2293-5726 Anulli, F https://orcid.org/0000-0003-2734-130X Aoki, M https://orcid.org/0000-0001-7498-0097 Aoki, T https://orcid.org/0000-0002-6618-5170 Aparo, MA https://orcid.org/0000-0003-4675-7810 Aperio Bella, L https://orcid.org/0000-0003-3942-1702 Apicella, M Appelt, C https://orcid.org/0000-0003-1205-6784 Apyan, A https://orcid.org/0000-0002-9418-6656 Arampatzi, M https://orcid.org/0009-0000-7951-7843 Arbiol Val, SJ https://orcid.org/0000-0002-8849-0360 https://escholarship.org/uc/item/6x59m1q0 The total and differential Higgs boson production cross-sections are measured through a combined statistical analysis of the H → ZZ* → 4ℓ and H → γγ decay channels. The results are based on a dataset of 139 fb−1 of proton–proton collisions at a centre-of-mass energy of 13 TeV, recorded by the ATLAS detector at the Large Hadron Collider. The measured total Higgs boson production cross-section is 55.5−3.8+4.0$$ {55.5}_{-3.8}^{+4.0} $$ pb, consistent with the Standard Model prediction of 55.6 ± 2.5 pb. All results from the two decay channels are compatible with each other, and their combination agrees with the Standard Model predictions. A combined statistical interpretation of the measured fiducial cross-sections as a function of the Higgs boson transverse momentum is performed in order to probe the Yukawa couplings to the bottom and charm quarks. A similar interpretation is performed by including also the constraints from the measurements of Higgs boson production in association... https://escholarship.org/uc/item/6x59m1q0 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abbott, DC Abeling, K Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Abusleme Hoffman, AC Acharya, BS Achkar, B Adam Bourdarios, C Adamczyk, L Adamek, L Addepalli, SV Adelman, J Adiguzel, A Adorni, S Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Aguilar-Saavedra, JA Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Al Khoury, K Alberghi, GL Albert, J Albicocco, P Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Alhroob, M Ali, B Ali, S Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allport, PP Aloisio, A Alonso, F Alpigiani, C Alunno Camelia, E Alvarez Estevez, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amoroso, S Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Antrim, DJA Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA Aperio Bella, L Appelt, C Aranzabal, N Araujo Ferraz, V Arcangeletti, C Arce, ATH Arena, E https://escholarship.org/uc/item/6v43m3z1 A search for long-lived particles in events with significant missing transverse momentum and at least one displaced vertex is presented. This analysis is performed using 137 fb−1 of pp collision data collected between 2016–2018 during Run 2 of the Large Hadron Collider by the ATLAS detector. Displaced vertices are identified using two different secondary vertexing algorithms, including a novel “fuzzy” vertexing algorithm optimized for identifying displaced decays of heavy quarks. Separate searches are performed using each algorithm, and the expected Standard Model background is independently estimated for each search using a data-driven procedure. No significant excess is observed over the background in either case. The results are used to set 95% confidence-level limits on potential beyond-the-Standard Model physics that could produce this final state. Results are interpreted in the context of four models: long-lived gluinos that form R-hadrons before decaying, neutralinos decaying... https://escholarship.org/uc/item/6v43m3z1 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Aperio Bella, L Apicella, M Appelt, C Apyan, A Arampatzi, M https://escholarship.org/uc/item/6pd901xm The ATLAS Collaboration at CERN’s Large Hadron Collider is at the forefront of particle physics research and is equally committed to bridging the gap between cutting-edge science and the wider public. Since 2010, the ATLAS Virtual Visits programme has provided live, interactive tours of the ATLAS detector and control room to global audiences in their language, without the need to travel. The programme has grown significantly since its inception, as demonstrated by quantitative data collected since January 2019 and case studies of large-scale implementations in Brazil and Greece. The impact on individual participants is also discussed. https://escholarship.org/uc/item/6pd901xm Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Ambler, A Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Dos Santos, SP Amor Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony-Kittelsen, K Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio https://escholarship.org/uc/item/6cs5w4mz Entanglement is a key property of quantum systems. In this Letter the first measurements of quantum entanglement between spins in pairs of bosons are reported, using proton-proton collision data from the Large Hadron Collider (LHC) at center-of-mass energies of 13 and 13.6&nbsp;TeV, recorded with the ATLAS detector. Measurements of angular observables sensitive to spin-density-matrix elements in the process yield coefficients and , consistent with their Standard Model predictions. A complementary hypothesis test using the full angular distribution, and relying on several Standard Model assumptions in the decays, provides substantially higher sensitivity to quantum correlations and disfavors the separable-state hypothesis at a significance of 4.7 standard deviations (expected ) relative to the entangled Standard Model hypothesis. These results provide strong evidence of quantum entanglement between massive bosons (spin qutrits) at the electroweak scale. https://escholarship.org/uc/item/6cs5w4mz Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Saavedra, JA Aguilar Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio Apicella, M Appelt, C Apyan, A Arampatzi, M https://escholarship.org/uc/item/6bc147tz This paper presents measurements of charged-hadron spectra obtained in pp, p+Pb, and Pb+Pb collisions at s$$ \sqrt{s} $$ or sNN$$ \sqrt{s_{\textrm{NN}}} $$ = 5.02 TeV, and in Xe+Xe collisions at sNN$$ \sqrt{s_{\textrm{NN}}} $$ = 5.44 TeV. The data recorded by the ATLAS detector at the LHC have total integrated luminosities of 25 pb−1, 28 nb−1, 0.50 nb−1, and 3 μb−1, respectively. The nuclear modification factors RpPb and RAA are obtained by comparing the spectra in heavy-ion and pp collisions in a wide range of charged-particle transverse momenta and pseudorapidity. The nuclear modification factor RpPb shows a moderate enhancement above unity with a maximum at pT ≈ 3 GeV; the enhancement is stronger in the Pb-going direction. The nuclear modification factors in both Pb+Pb and Xe+Xe collisions feature a significant, centrality-dependent suppression. They show a similar distinct pT-dependence with a local maximum at pT ≈ 2 GeV and a local minimum at pT ≈ 7 GeV. This dependence is... https://escholarship.org/uc/item/6bc147tz Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abeling, K Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Abusleme Hoffman, AC Acharya, BS Adam Bourdarios, C Adamczyk, L Adamek, L Addepalli, SV Adelman, J Adiguzel, A Adorni, S Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Aguilar-Saavedra, JA Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Al Khoury, K Alberghi, GL Albert, J Albicocco, P Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Alhroob, M Ali, B Ali, S Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Antrim, DJA Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA Aperio Bella, L Appelt, C Aranzabal, N Araujo Ferraz, V Arcangeletti, C Arce, ATH Arena, E https://escholarship.org/uc/item/68d3m9h5 Wilson coefficients in dimension-six effective field theory are constrained in a combined fit to several ATLAS measurements. These inputs probe Higgs-boson processes across multiple production and decay modes, di-Higgs signatures in the bb¯γγ$$ b\overline{b}\gamma \gamma $$ and bb¯ττ$$ b\overline{b}\tau \tau $$ final states, WW and WZ diboson signatures, electroweak Zjj final states, high-mass Drell–Yan interactions, and tt¯$$ t\overline{t} $$ events in both resolved and boosted topologies. Precision electroweak observables from LEP, SLD, and ATLAS are also included. A total of 48 parameters, including individual Wilson coefficients in the Warsaw basis and linear combinations of Wilson coefficients, are constrained simultaneously. Constraints on two-Higgs-doublet models and heavy-vector-boson models are also obtained by matching a relevant sub-set of the results with their parameters. This combined fit provides the most comprehensive effective field theory interpretation of experimental... https://escholarship.org/uc/item/68d3m9h5 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Aperio Bella, L Apicella, M Appelt, C Apyan, A Arampatzi, M Arbiol Val, SJ https://escholarship.org/uc/item/63p6c3mp A search is conducted in proton–proton collisions at the Large Hadron Collider for photon-induced production pp → pp + γγ, (γγ → VX) of a visible particle V decaying into a pair of same-flavour charged leptons (e+e− or μ+μ−) and an undetected invisible component X. Measurements of the outgoing proton energies by the ATLAS forward proton spectrometer allow the full photon–photon four-momentum to be reconstructed. By subtracting the visible four-momentum of the central system measured with the ATLAS detector, the “missing mass” of any event components not detected in the central region can be reconstructed, enabling the reconstruction of X without knowing its properties, thus allowing the search to be model-independent. A search for a narrow resonance is performed in the missing-mass spectrum between 100 GeV and 900 GeV. The analysis uses data collected in 2017 from proton–proton collisions at a centre-of-mass energy of s=13$$ \sqrt{s}=13 $$ TeV, corresponding to an integrated luminosity... https://escholarship.org/uc/item/63p6c3mp Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amor Dos Santos, SP Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Aperio Bella, L Apicella, M https://escholarship.org/uc/item/63b8x7wq This report provides an overview of the new results obtained by the ATLAS Collaboration at the LHC, which were presented at the Quark Matter 2018 conference. These measurements were covered in 12 parallel talks, one flash talk and 11 posters. In this document, a discussion of results is grouped into four areas: electromagnetic interactions, jet quenching, quarkonia and heavy-flavour production, and collectivity in small and larger systems. Measurements from the xenon-xenon collisions based on a short run collected in October 2017 are reported for the first time. https://escholarship.org/uc/item/63b8x7wq Wed, 30 Sep 2026 00:00:00 +0000 Grabowska-Bold, Iwona Collaboration, ATLAS https://escholarship.org/uc/item/62p07351 This short summary presents latest measurements of the nuclear modification factor, R AA, for R = 0.4 jets in Pb+Pb collisions at s N N = 5.02 TeV with the ATLAS detector at the LHC. The analysis is performed over a large range of transverse momentum, up to p T = 1 TeV, and differentially in jet p T, rapidity, and collision centrality. The jet R AA is measured also differentially in the jet mass, m, which provides new information on the dependence of the energy loss on the substructure of jets. Latest results by ATLAS on the dijet momentum balance in Xe+Xe collisions at s N N = 5.44 TeV are presented and compared to the same quantity measured in Pb+Pb collisions at s N N = 5.02 TeV . These recent measurements should help us understand mechanisms of parton energy loss and properties of hot and dense matter created in heavy-ion collisions. https://escholarship.org/uc/item/62p07351 Wed, 30 Sep 2026 00:00:00 +0000 Spousta, Martin Collaboration, ATLAS https://escholarship.org/uc/item/5sk6656s A search for a new gauge boson predicted by models, based on charged-current Drell–Yan production, , is presented. The data sample used corresponds to an integrated luminosity of of proton–proton collisions at recorded by the ATLAS detector at the Large Hadron Collider. The search examines a final state of plus large missing transverse momentum. Upper limits are set on the production cross section times branching ratio in the mass range of 5–81&nbsp;GeV. After combining with the previous search using the neutral-current Drell–Yan production with a final state, the most stringent exclusion limits to date are achieved in the parameter space of the coupling strength and mass. © 2024 CERN, for the ATLAS Collaboration 2024 CERN https://escholarship.org/uc/item/5sk6656s Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Flores, CA Allendes Allport, PP Aloisio, A Alonso, F Alpigiani, C Estevez, M Alvarez Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amirie, KJ Dos Santos, SP Amor Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T https://escholarship.org/uc/item/5pr793nh Recent measurements of the correlations between flow harmonics obtained using four-particle symmetric cumulants and three-particle asymmetric cumulants with the ATLAS detector at the LHC are described. The data sets of pp, p+Pb and peripheral Pb+Pb collisions at various energies are analyzed, aiming to probe the long-range collective nature of multi-particle production in small systems. The sensitivity of the standard cumulant method to non-flow correlations is investigated by introducing the subevents method. A systematic reduction of non-flow effects is observed when using the two-subevent method. Further reduction is observed with the three-subevent method that is consistent with the results obtained with the four-subevent one. A negative correlation between ν 2 and ν 3 and a positive correlation between ν 2 and ν 4, for all studied collision systems and over full multiplicity range, is observed. The correlation strength computed as symmetric cumulants normalized by the 〈 ν... https://escholarship.org/uc/item/5pr793nh Wed, 30 Sep 2026 00:00:00 +0000 Derendarz, Dominik Collaboration, ATLAS https://escholarship.org/uc/item/5g36t1pf Events with t-channel single top quarks are used to probe effective field theory operators in s=13$$ \sqrt{s}=13 $$ TeV proton–proton collision data corresponding to 140 fb−1 recorded by the ATLAS detector at the Large Hadron Collider. To extract a maximum amount of information from these events, the joint fourfold probability distribution for four kinematic angles is simultaneously analysed. A method leveraging Fourier techniques to handle the challenges arising from this approach is employed. The relevant effective field theory operators are those sensitive to top-quark decay and t-channel production vertices. Their Wilson coefficients are tightly constrained, with results compatible with Standard Model predictions. https://escholarship.org/uc/item/5g36t1pf Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abulaiti, Y Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Allport, PP Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amezza, T Amidei, D Amini, B Amirie, K Amirkhanov, A Amor Dos Santos, SP Amos, KR Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F https://escholarship.org/uc/item/594823qn This paper presents a search for hypothetical massive, charged, long-lived particles with the ATLAS detector at the LHC using an integrated luminosity of 139 fb−1 of proton–proton collisions at s$$ \sqrt{s} $$ = 13 TeV. These particles are expected to move significantly slower than the speed of light and should be identifiable by their high transverse momenta and anomalously large specific ionisation losses, dE/dx. Trajectories reconstructed solely by the inner tracking system and a dE/dx measurement in the pixel detector layers provide sensitivity to particles with lifetimes down to O$$ \mathcal{O} $$(1) ns with a mass, measured using the Bethe–Bloch relation, ranging from 100 GeV to 3 TeV. Interpretations for pair-production of R-hadrons, charginos and staus in scenarios of supersymmetry compatible with these particles being long-lived are presented, with mass limits extending considerably beyond those from previous searches in broad ranges of lifetime. https://escholarship.org/uc/item/594823qn Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abbott, DC Abed Abud, A Abeling, K Abhayasinghe, DK Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Abusleme Hoffman, AC Acharya, BS Achkar, B Adam, L Adam Bourdarios, C Adamczyk, L Adamek, L Addepalli, SV Adelman, J Adiguzel, A Adorni, S Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agapopoulou, C Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Aguilar-Saavedra, JA Ahmad, A Ahmadov, F Ahmed, WS Ai, X Aielli, G Aizenberg, I Akatsuka, S Akbiyik, M Åkesson, TPA Akimov, AV Al Khoury, K Alberghi, GL Albert, J Albicocco, P Alconada Verzini, MJ Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Alhroob, M Ali, B Ali, S Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allport, PP Aloisio, A Alonso, F Alpigiani, C Alunno Camelia, E Alvarez Estevez, M Alviggi, MG Amaral Coutinho, Y Ambler, A Ambroz, L Amelung, C Amidei, D Amor Dos Santos, SP Amoroso, S Amos, KR Amrouche, CS Ananiev, V Anastopoulos, C Andari, N Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Antrim, DJA Anulli, F Aoki, M Aparisi Pozo, JA Aparo, MA Aperio Bella, L Aranzabal, N Araujo Ferraz, V Arcangeletti, C https://escholarship.org/uc/item/5610f15z A measurement of the production of W bosons with opposite electric charges in association with two jets is presented based on 140 fb−1 of data collected by the ATLAS detector in proton-proton collisions at s$$ \sqrt{s} $$ = 13 TeV. The analysis is sensitive to the scattering of W bosons, which is of particular interest in the ATLAS physics programme as it can be used to probe the electroweak symmetry breaking mechanism of the Standard Model. This signal is observed with a significance of 7.1 standard deviations above the background expectation, while 6.2 standard deviations were expected. The measured cross-section is determined in a signal-enriched fiducial volume and is found to be 2.7 ± 0.5 fb, which is consistent with the theoretical prediction of 2.20−0.13+0.14$$ {2.20}_{-0.13}^{+0.14} $$ fb. https://escholarship.org/uc/item/5610f15z Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA Aperio Bella, L Appelt, C https://escholarship.org/uc/item/4ww753w8 This paper reports a search for decays of long-lived charginos or τ-sleptons to final states containing a short disappearing track, a single high-energy jet, and missing transverse momentum. The search uses 137 fb−1 of data from 13 TeV proton–proton collisions recorded by the ATLAS detector during Run 2 of the LHC. Multiple search regions are defined, all requiring the presence of a track reconstructed from either three or four measurements in the innermost layers of the ATLAS detector. Regions with tracks having only three measurements are further characterised by the absence or presence of a low-energy charged pion reconstructed using a dedicated algorithm, leveraging machine learning. Data-driven methods are used to estimate the background contributions in the search regions. No significant excesses are found and 95% CL lower limits are placed on the masses of charginos and τ-sleptons in the lifetime range 0.01–10 ns. Observed (expected) mass limits of up to 225 GeV (250 GeV)... https://escholarship.org/uc/item/4ww753w8 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Aperio Bella, L Apicella, M Appelt, C Apyan, A Arampatzi, M https://escholarship.org/uc/item/4v08g6zb This paper presents the first search for non-resonant Higgs boson pair production in association with a top-quark pair (tt¯HH$$ t\overline{t} HH $$) using proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider. The data sample corresponds to an integrated luminosity of 196 fb−1, comprising 140 fb−1 at a centre-of-mass energy of s=13$$ \sqrt{s}=13 $$ TeV and 56 fb−1 at 13.6 TeV. The search targets three distinct final states expected from tt¯HH$$ t\overline{t} HH $$ decays: (i) one lepton (electron or muon) with at least five b-quarks, (ii) at least two b-quarks accompanied by two leptons with the same electric charges or multiple leptons, and (iii) at least three b-quarks with two photons. The tt¯HH$$ t\overline{t} HH $$ production cross-section, relative to its Standard Model prediction, is measured to be μtt¯HH=−3−12+11$$ {\mu}_{t\overline{t} HH}=-{3}_{-12}^{+11} $$. This result corresponds to a 95% confidence-level upper limit of 20 times... https://escholarship.org/uc/item/4v08g6zb Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Aperio Bella, L Apicella, M Appelt, C Apyan, A Arampatzi, M https://escholarship.org/uc/item/4k7103z5 A search for heavy pseudo-scalar (A) and scalar (H) Higgs bosons decaying into a top-quark pair (tt¯$$ t\overline{t} $$) has been performed with 140 fb−1 of proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider at a centre-of-mass energy of s$$ \sqrt{s} $$ = 13 TeV. Interference effects between the signal process and Standard Model (SM) tt¯$$ t\overline{t} $$ production are taken into account. Final states with exactly one or exactly two electrons or muons are considered. No significant deviation from the SM prediction is observed. The results of the search are interpreted in the context of a two-Higgs-doublet model (2HDM) of type II in the alignment limit with mass-degenerate pseudo-scalar and scalar Higgs bosons (mA = mH) and the hMSSM parameterisation of the minimal supersymmetric extension of the Standard Model. Ratios of the two vacuum expectation values, tan β, smaller than 3.49 (3.16) are excluded at 95% confidence level for mA = mH... https://escholarship.org/uc/item/4k7103z5 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amirie, KJ Amor Dos Santos, SP Amos, KR An, S Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M https://escholarship.org/uc/item/3ws889fs A search is conducted for new phenomena in events with a top quark pair and large missing transverse momentum, where the top quark pair is reconstructed in final states with one isolated electron or muon and multiple jets. The search is performed using the Large Hadron Collider proton-proton collision data sample at a centre-of-mass energy of s$$ \sqrt{s} $$ = 13 TeV recorded by the ATLAS detector that corresponds to an integrated luminosity of 140 fb−1. An analysis based on neural network classifiers is optimised to search for directly produced pairs of supersymmetric partners of the top quark (stop), and to search for spin-0 mediators, produced in association with a pair of top quarks, that decay into dark-matter particles. In the stop search, the analysis is designed to target models in which the mass difference between the stop and the neutralino from the stop decay is close to the top quark mass. This new search is combined with previously published searches in final states... https://escholarship.org/uc/item/3ws889fs Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amirie, KJ Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Anulli, F https://escholarship.org/uc/item/3qm6n6tg A search is presented for non-resonant Higgs boson pair production, targeting the bbZZ, 4V (V = W or Z), VVττ, 4τ, γγVV and γγττ decay channels. Events are categorised based on the multiplicity of light charged leptons (electrons or muons), hadronically decaying tau leptons, and photons. The search is based on a data sample of proton-proton collisions at s$$ \sqrt{s} $$ = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb−1. No evidence of the signal is found and the observed (expected) upper limit on the cross-section for non-resonant Higgs boson pair production is determined to be 17 (11) times the Standard Model predicted cross-section at 95% confidence level under the background-only hypothesis. The observed (expected) constraints on the HHH coupling modifier, κλ, are determined to be −6.2 &lt; κλ&lt; 11.6 (−4.5 &lt; κλ&lt; 9.6) at 95% confidence level, assuming the Standard Model for the expected... https://escholarship.org/uc/item/3qm6n6tg Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amirie, KJ Amor Dos Santos, SP Amos, KR An, S Ananiev, V Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M https://escholarship.org/uc/item/3n01s7mg A search for charged lepton flavour violation in τ → 3μ decays is performed in pp collisions at a centre-of-mass energy of 13 TeV using ATLAS data collected between 2016 and 2018, corresponding to an integrated luminosity of 137 fb − 1 . The search is optimised for the electroweak W → τν production channel, due to its higher trigger efficiency, but also considers potential signal events from heavy-flavour production. Data are collected using two-muon and three-muon triggers and a multivariate analysis is used to separate the signal from the background. An unbinned likelihood fit is then performed to the resulting three-muon invariant mass spectrum and the data are found to be compatible with the background-only hypothesis. The observed (expected) limit on the branching ratio B(τ → 3μ) is found to be 8.7 × 10 − 8 ( 7.5 × 10 − 8 ) at 90% CL https://escholarship.org/uc/item/3n01s7mg Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio Apicella, M Appelt, C Apyan, A Arampatzi, M Val, SJ Arbiol https://escholarship.org/uc/item/3h05v1zr Volume 3 of the FCC Feasibility Report presents studies related to civil engineering, the development of a project implementation scenario, and environmental and sustainability aspects. The report details the iterative improvements made to the civil engineering concepts since 2018, taking into account subsurface conditions, accelerator and experiment requirements, and territorial considerations. It outlines a technically feasible and economically viable civil engineering configuration that serves as the baseline for detailed subsurface investigations, construction design, cost estimation, and project implementation planning. Additionally, the report highlights ongoing subsurface investigations in key areas to support the development of an improved 3D subsurface model of the region. The report describes the development of the project scenario based on the ‘avoid-reduce-compensate’ iterative optimisation approach. The reference scenario balances optimal physics performance with... https://escholarship.org/uc/item/3h05v1zr Wed, 30 Sep 2026 00:00:00 +0000 Benedikt, M Zimmermann, F Auchmann, B Bartmann, W Burnet, JP Carli, C Chancé, A Craievich, P Giovannozzi, M Grojean, C Gutleber, J Hanke, K Henriques, A Janot, P Lourenço, C Mangano, M Otto, T Poole, J Rajagopalan, S Raubenheimer, T Todesco, E Ulrici, L Watson, T Wilkinson, G Abada, A Abbrescia, M Abdolmaleki, H Abidi, SH Abramov, A Adam, C Ady, M Adz̆ić, PR Agapov, I Aguglia, D Ahmed, I Aiba, M Aielli, G Akan, T Akchurin, N Akturk, D Al-Thakeel, M Alberghi, GL Alcaraz Maestre, J Aleksa, M Aleksan, R Alharthi, F Alimena, J Alimenti, A Alioli, S Alix, L Allanach, BC Allwicher, L Altintas, AA Altınlı, M Alviggi, M Ambrosio, G Amhis, Y Amiri, A Ammirabile, G Andeen, T André, KDJ Andrea, J Andreazza, A Andreini, M Andriollo, T Angel, L Angelucci, M Antusch, S Anwar, MN Apolinário, L Apollinari, G Appleby, RB Apresyan, A Apyan, Aram Apyan, Armen Arbey, A Argiento, B Ari, V Arias, S Arias Alonso, B Arnaez, O Arnaldi, R Arneodo, F Arnold, H Arrutia Sota, P Ascioti, ME Assamagan, KA Aumiller, S Aydın, G Azizi, K Azzi, P Bacchetta, N Bacci, A Bai, B Bai, Y Balconi, L Baldinelli, G Balhan, B Ball, AH Ballarino, A https://escholarship.org/uc/item/3676b2fk V. Krutelyov, of Texas A&amp;M University and the University of California at Santa Barbara, was erroneously omitted from the author list. https://escholarship.org/uc/item/3676b2fk Wed, 30 Sep 2026 00:00:00 +0000 Aaltonen, T Amerio, S Amidei, D Anastassov, A Annovi, A Antos, J Apollinari, G Appel, JA Arisawa, T Artikov, A Asaadi, J Ashmanskas, W Auerbach, B Aurisano, A Azfar, F Badgett, W Bae, T Barbaro-Galtieri, A Barnes, VE Barnett, BA Barria, P Bartos, P Bauce, M Bedeschi, F Behari, S Bellettini, G Bellinger, J Benjamin, D Beretvas, A Bhatti, A Bland, KR Blumenfeld, B Bocci, A Bodek, A Bortoletto, D Boudreau, J Boveia, A Brigliadori, L Bromberg, C Brucken, E Budagov, J Budd, HS Burkett, K Busetto, G Bussey, P Butti, P Buzatu, A Calamba, A Camarda, S Campanelli, M Canelli, F Carls, B Carlsmith, D Carosi, R Carrillo, S Casal, B Casarsa, M Castro, A Catastini, P Cauz, D Cavaliere, V Cavalli-Sforza, M Cerri, A Cerrito, L Chen, YC Chertok, M https://orcid.org/0000-0002-2729-6273 Chiarelli, G Chlachidze, G Cho, K Chokheli, D Ciocci, MA Clark, A Clarke, C Convery, ME Conway, J Corbo, M Cordelli, M Cox, CA Cox, DJ Cremonesi, M Cruz, D Cuevas, J Culbertson, R d’Ascenzo, N Datta, M De Barbaro, P Demortier, L Deninno, M Devoto, F d’Errico, M Di Canto, A Di Ruzza, B Dittmann, JR D’Onofrio, M Donati, S Dorigo, M Driutti, A Ebina, K Edgar, R Elagin, A https://escholarship.org/uc/item/33r49574 A search for leptoquarks decaying into the bτ final state is performed using Run 2 proton-proton collision data from the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb−1 at s$$ \sqrt{s} $$ = 13 TeV recorded by the ATLAS detector. The benchmark models considered in this search are vector leptoquarks with electric charge of 2/3e and scalar leptoquarks with an electric charge of 4/3e. No significant excess above the Standard Model prediction is observed, and 95% confidence level upper limits are set on the cross-section times branching fraction of leptoquarks decaying into bτ. For the vector leptoquark production two models are considered: the Yang-Mills and Minimal coupling models. In the Yang-Mills (Minimal coupling) scenario, vector leptoquarks with a mass below 1.58 (1.35) TeV are excluded for a gauge coupling of 1.0 and below 2.05 (1.99) TeV for a gauge coupling of 2.5. In the case of scalar leptoquarks, masses below 1.28 (1.53) TeV are excluded for... https://escholarship.org/uc/item/33r49574 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Abusleme Hoffman, AC Acharya, BS Adam Bourdarios, C Adamczyk, L Adamek, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Antrim, DJA Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA https://escholarship.org/uc/item/32h427gr Measurements of isolated prompt photon and massive electroweak (W and Z) boson production in different collision systems are of great interest to understand the partonic structure of heavy nuclei, and serve as a constraint on the initial state in larger collision systems. These channels are sensitive to a variety of effects such as the modification of the parton densities in nuclei in certain kinematic regions, and the energy loss of partons as they undergo multiple interactions in the nucleus before the hard parton-parton scattering. High-statistics samples of lead–lead and proton–lead collision data at s NN = 5.02 TeV and 8.16 TeV , respectively, taken by the ATLAS experiment at the LHC, as well as proton–proton comparison data at analogous collision energies, allow for a detailed study of these phenomena in data and comprehensive comparisons to the predictions of a variety of theoretical approaches. This paper presents the latest ATLAS results in these topics, including updated... https://escholarship.org/uc/item/32h427gr Wed, 30 Sep 2026 00:00:00 +0000 Citron, Zvi Collaboration, ATLAS https://escholarship.org/uc/item/31t546c2 Combination of searches for heavy resonances decaying into bosonic and leptonic final states using 36 fb^-1 of proton-proton collision data at √<i>s</i>=13 TeV with the ATLAS detector https://escholarship.org/uc/item/31t546c2 Wed, 30 Sep 2026 00:00:00 +0000 Aaboud, M Aad, G Abbott, B Abdinov, O Abeloos, B Abhayasinghe, DK Abidi, SH AbouZeid, OS Abraham, NL Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Adachi, S Adamczyk, L Adelman, J Adersberger, M Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agheorghiesei, C Aguilar-Saavedra, JA Ahmadov, F Aielli, G Akatsuka, S Akesson, TPA Akilli, E Akimov, AV Alberghi, GL Albert, J Albicocco, P Verzini, MJ Alconada Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alhroob, M Ali, B Alimonti, G Alison, J Alkire, SP Allaire, C Allbrooke, BMM Allen, BW Allport, PP Aloisio, A Alonso, A Alonso, F Alpigiani, C Alshehri, AA Alstaty, MI Gonzalez, B Alvarez Piqueras, D Alvarez Alviggi, MG Amadio, BT Coutinho, Y Amaral Ambroz, L Amelung, C Amidei, D Dos Santos, SP Amor Amoroso, S Amrouche, CS Anastopoulos, C Ancu, LS Andari, N Andeen, T Anders, CF Anders, JK Anderson, KJ Andreazza, A Andrei, V Anelli, CR Angelidakis, S Angelozzi, I Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antonelli, M Antrim, DJA Anulli, F Aoki, M Pozo, JA Aparisi Bella, L Aperio Arabidze, G Araque, JP Ferraz, V Araujo Pereira, R Araujo Arce, ATH Ardell, RE Arduh, FA Arguin, J-F Argyropoulos, S Armbruster, AJ Armitage, LJ Armstrong, A Arnaez, O https://escholarship.org/uc/item/304982jk A search for a heavy CP-odd Higgs boson, A, decaying into a Z boson and a heavy CP-even Higgs boson, H, is presented. It uses the full LHC Run 2 dataset of pp collisions at s$$ \sqrt{s} $$ = 13 TeV collected with the ATLAS detector, corresponding to an integrated luminosity of 140 fb−1. The search for A → ZH is performed in the ℓ+ℓ−tt¯$$ {\ell}^{+}{\ell}^{-}t\overline{t} $$ and νν¯bb¯$$ u \overline{ u}b\overline{b} $$ final states and surpasses the reach of previous searches in different final states in the region with mH &gt; 350 GeV and mA &gt; 800 GeV. No significant deviation from the Standard Model expectation is found. Upper limits are placed on the production cross-section times the decay branching ratios. Limits with less model dependence are also presented as functions of the reconstructed m(tt¯$$ t\overline{t} $$) and m(bb¯$$ b\overline{b} $$) distributions in the ℓ+ℓ−tt¯$$ {\ell}^{+}{\ell}^{-}t\overline{t} $$ and νν¯bb¯$$ u \overline{ u}b\overline{b} $$ channels,... https://escholarship.org/uc/item/304982jk Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA Aperio Bella, L https://escholarship.org/uc/item/2xs487xj A search for quantum black holes in electron+jet or muon+jet final states with high invariant mass is performed. The analysis uses data from s = 13.6 TeV pp collisions recorded by the ATLAS detector between 2022 and 2024 during Run 3 of the Large Hadron Collider, corresponding to an integrated luminosity of 164 fb − 1 . This search is strongly motivated by a dramatic increase of the production cross-section by up to an order of magnitude for the highest masses considered, thanks to the small increase of 0.6 TeV in centre-of-mass energy between Run 2 and Run 3. No significant excess above the Standard Model background is observed, and 95% CL upper limits are set on the production cross-section times branching ratio in several benchmark models, reaching a mass scale of 9.4 TeV. These represent the strongest exclusion limits to date on quantum black hole production. https://escholarship.org/uc/item/2xs487xj Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio Apicella, M Appelt, C Apyan, A Arampatzi, M Val, SJ Arbiol https://escholarship.org/uc/item/2w6443qh A search for a new massive charged gauge boson, W′, is performed with the ATLAS detector at the LHC. The dataset used in this analysis was collected from proton-proton collisions at a centre-of-mass energy of s$$ \sqrt{s} $$ = 13 TeV, and corresponds to an integrated luminosity of 139 fb−1. The reconstructed tb invariant mass is used to search for a W′ boson decaying into a top quark and a bottom quark. The result is interpreted in terms of a W′ boson with purely right-handed or left-handed chirality in a mass range of 0.5–6 TeV. Different values for the coupling of the W′ boson to the top and bottom quarks are considered, taking into account interference with single-top-quark production in the s-channel. No significant deviation from the background prediction is observed. The results are expressed as upper limits on the W′ → tb production cross-section times branching ratio as a function of the W′-boson mass and in the plane of the coupling vs the W′-boson mass. https://escholarship.org/uc/item/2w6443qh Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Abusleme Hoffman, AC Acharya, BS Adam Bourdarios, C Adamczyk, L Adamek, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA https://escholarship.org/uc/item/2bg7f9dp The published article has been revised. The name of the author Pramod Sharma was previously incorrect and appeared as Pramond Sharma. The original article has been corrected. https://escholarship.org/uc/item/2bg7f9dp Wed, 30 Sep 2026 00:00:00 +0000 Benedikt, M Zimmermann, F Auchmann, B Bartmann, W Burnet, JP Carli, C Chancé, A Craievich, P Giovannozzi, M Grojean, C Gutleber, J Hanke, K Henriques, André Janot, P Lourenço, C Mangano, M Otto, T Poole, J Rajagopalan, S Raubenheimer, T Todesco, E Ulrici, L Watson, T Wilkinson, G Azzi, P Bernardi, G Blondel, A Boscolo, M d’Enterria, D Dam, M de Blas, J Francois, B Freitas, A Ganis, G Keintzel, J Klute, M McCullough, M Monni, PF Palla, F Perez, E Pleier, M-A Riegler, W Sefkow, F Selvaggi, M Abada, A Abbrescia, M Abdolmaleki, H Abidi, SH Abramov, A Adam, C Ady, M Adz̆ić, PR Agapov, I Aguglia, D Ahmed, I Aiba, M Aielli, G Akan, T Akchurin, N Akturk, D Al-Thakeel, M Alberghi, GL Maestre, J Alcaraz Aleksa, M Aleksan, R Alharthi, F Alimena, J Alimenti, A Alioli, S Alix, L Allanach, BC Allwicher, L Altintas, AA Altınlı, M Alviggi, M Ambrosio, G Amhis, Y Amiri, A Ammirabile, G Andeen, T André, KDJ Andrea, J Andreazza, A Andreini, M Andriollo, T Angel, L Angelucci, M Antusch, S Anwar, MN Apolinário, L Apollinari, G Appleby, RB Apresyan, A Apyan, Aram Apyan, Armen Arbey, A Argiento, B Ari, V Arias, S Alonso, B Arias https://escholarship.org/uc/item/2bf948wj Heavy-flavor hadron production and collective motion in A+A collisions provide insight into the energy loss mechanism and transport properties of heavy quarks in the QGP. The same measurements in p+A collisions serve as an important baseline for understanding the observations in A+A collisions. For example, detailed studies of heavy-flavor hadron azimuthal anisotropy in p+A collisions may help to address whether the observed long-range “ridge” correlation arises from hard or semi-hard processes, or if it is the result of mechanisms unrelated to the initial hardness scale. These proceedings summarize heavy-flavor hadron production, via their semi-leptonic decay to muons in 2.76 TeV Pb+Pb and pp collisions, non-prompt J/ψ in 5.02 TeV Pb+Pb and pp collisions, and prompt D 0 mesons in 8.16 TeV p+Pb collisions using ATLAS detector at the LHC. Azimuthal anisotropy of heavy-flavor hadrons is studied via their decay muons in 2.76 TeV Pb+Pb and 8.16 TeV p+Pb collisions, and via non-prompt... https://escholarship.org/uc/item/2bf948wj Wed, 30 Sep 2026 00:00:00 +0000 Hu, Qipeng Collaboration, ATLAS https://escholarship.org/uc/item/2252c90c This search, a type not previously performed at ATLAS, uses a comparison of the production cross sections for e + μ − and e − μ + pairs to constrain physics processes beyond the Standard Model. It uses 139 fb − 1 of proton–proton collision data recorded at s = 13 TeV at the LHC. Targeting sources of new physics which prefer final states containing e + μ − to e − μ + , the search contains two broad signal regions which are used to provide model-independent constraints on the ratio of cross sections at the 2% level. The search also has two special selections targeting supersymmetric models and leptoquark signatures. Observations using one of these selections are able to exclude, at 95% confidence level, singly produced smuons with masses up to 640GeV in a model in which the only other light sparticle is a neutralino when the R-parity-violating coupling λ 231 ′ is close to unity. Observations using the other selection exclude scalar leptoquarks with masses below 1880GeV when g 1R... https://escholarship.org/uc/item/2252c90c Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abbott, DC Abud, A Abed Abeling, K Abhayasinghe, DK Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Hoffman, AC Abusleme Acharya, BS Achkar, B Adam, L Bourdarios, C Adam Adamczyk, L Adamek, L Addepalli, SV Adelman, J Adiguzel, A Adorni, S Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agapopoulou, C Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Aguilar-Saavedra, JA Ahmad, A Ahmadov, F Ahmed, WS Ai, X Aielli, G Aizenberg, I Akatsuka, S Akbiyik, M Åkesson, TPA Akimov, AV Al Khoury, K Alberghi, GL Albert, J Albicocco, P Verzini, MJ Alconada Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Alhroob, M Ali, B Ali, S Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allport, PP Aloisio, A Alonso, F Alpigiani, C Camelia, E Alunno Estevez, M Alvarez Alviggi, MG Coutinho, Y Amaral Ambler, A Ambroz, L Amelung, C Amidei, D Dos Santos, SP Amor Amoroso, S Amos, KR Amrouche, CS Ananiev, V Anastopoulos, C Andari, N Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Antrim, DJA Anulli, F Aoki, M Pozo, JA Aparisi Aparo, MA Bella, L Aperio Aranzabal, N Ferraz, V Araujo Arcangeletti, C https://escholarship.org/uc/item/1vf3h3sd A search for physics beyond the Standard Model inducing periodic signals in the dielectron and diphoton invariant mass spectra is presented using 139 fb−1 of s$$ \sqrt{s} $$ = 13 TeV pp collision data collected by the ATLAS experiment at the LHC. Novel search techniques based on continuous wavelet transforms are used to infer the frequency of periodic signals from the invariant mass spectra and neural network classifiers are used to enhance the sensitivity to periodic resonances. In the absence of a signal, exclusion limits are placed at the 95% confidence level in the two-dimensional parameter space of the clockwork gravity model. Model-independent searches for deviations from the background-only hypothesis are also performed. https://escholarship.org/uc/item/1vf3h3sd Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Abusleme Hoffman, AC Acharya, BS Adam Bourdarios, C Adamczyk, L Adamek, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Antrim, DJA Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA https://escholarship.org/uc/item/1pb4d7tc Inclusive, differential and production-mode cross-section measurements of the Higgs boson are performed in the H → ZZ* → 4ℓ decay channel. The analysis uses proton–proton collision data produced at the Large Hadron Collider at a centre-of-mass energy of s=13.6$$ \sqrt{s}=13.6 $$ TeV and recorded with the ATLAS detector, corresponding to an integrated luminosity of 164 fb−1. The inclusive fiducial cross-section for the H → ZZ* → 4ℓ process is measured to be σfid=3.65−0.33+0.35$$ {\sigma}_{\mathrm{fid}}={3.65}_{-0.33}^{+0.35} $$ fb, in agreement with the Standard Model prediction of σfidSM=3.68±0.17$$ {\sigma}_{\mathrm{fid}}^{\mathrm{SM}}=3.68\pm 0.17 $$ fb. Differential cross-sections are measured as a function of key kinematic observables of the Higgs boson and the four-lepton final state. Cross-sections are measured for the main production-modes in several exclusive regions of the Higgs boson production phase space and combined to measure an overall Higgs boson signal strength,... https://escholarship.org/uc/item/1pb4d7tc Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Aperio Bella, L Apicella, M Appelt, C Apyan, A Arampatzi, M Arbiol Val, SJ https://escholarship.org/uc/item/1mw744p5 This paper presents a search for top-squark pair production in final states with a top quark, a charm quark and missing transverse momentum. The data were collected with the ATLAS detector during LHC Run 2 and correspond to an integrated luminosity of 139 fb−1 of proton-proton collisions at a centre-of-mass energy of s$$ \sqrt{s} $$ = 13 TeV. The analysis is motivated by an extended Minimal Supersymmetric Standard Model featuring a non-minimal flavour violation in the second- and third-generation squark sector. The top squark in this model has two possible decay modes, either t~1→cχ~10$$ {\tilde{t}}_1\to c{\overset{\sim }{\chi}}_1^0 $$ or t~1→tχ~10$$ {\tilde{t}}_1\to t{\overset{\sim }{\chi}}_1^0 $$, where the χ~10$$ {\overset{\sim }{\chi}}_1^0 $$ is undetected. The analysis is optimised assuming that both of the decay modes are equally probable, leading to the most likely final state of tc+ETmiss$$ tc+{E}_T^{\textrm{miss}} $$. Good agreement is found between the Standard Model... https://escholarship.org/uc/item/1mw744p5 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA https://escholarship.org/uc/item/19s613bs A measurement of correction factors for the hadronic jet energy scale and resolution in the ATLAS detector is presented. These correction factors account for differences between simulated and observed data. They are obtained by analysing a selection of top quark events collected in proton–proton collisions by ATLAS between the years 2015 and 2018 at a centre-of-mass energy s=13$$\sqrt{s} = 13$$&nbsp;TeV$$\text {T{eV}}$$ as well as in 2022 and 2023 at s=13.6$$\sqrt{s} = 13.6$$&nbsp;TeV$$\text {T{eV}}$$. The impact of different jet energy scale or resolution corrections on the reconstructed mass of the hadronically decaying W boson from top-quark decays in simulation is quantified. The correction factors are extracted from a fit to the parameterised reconstructed W-boson mass distribution to data. The energy scale and resolution corrections are measured as a function of the jet transverse momentum between 20 and 200 GeV and absolute pseudorapidity less than 0.8. The uncertainties... https://escholarship.org/uc/item/19s613bs Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Aitbenchikh, B Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Ambler, A Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Santos, SP Amor Dos Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio Apicella, M https://escholarship.org/uc/item/18h1b6zb Measurements of transverse energy-energy correlations and their associated azimuthal asymmetries in multijet events are presented. The analysis is performed using a data sample corresponding to 139 fb−1 of proton-proton collisions at a centre-of-mass energy of s$$ \sqrt{s} $$ = 13 TeV, collected with the ATLAS detector at the Large Hadron Collider. The measurements are presented in bins of the scalar sum of the transverse momenta of the two leading jets and unfolded to particle level. They are then compared to next-to-next-to-leading-order perturbative QCD calculations for the first time, which feature a significant reduction in the theoretical uncertainties estimated using variations of the renormalisation and factorisation scales. The agreement between data and theory is good, thus providing a precision test of QCD at large momentum transfers Q. The strong coupling constant αs is extracted as a function of Q, showing a good agreement with the renormalisation group equation and... https://escholarship.org/uc/item/18h1b6zb Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abeling, K Abidi, SH Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Abusleme Hoffman, AC Acharya, BS Adam Bourdarios, C Adamczyk, L Adamek, L Addepalli, SV Adelman, J Adiguzel, A Adorni, S Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Aguilar-Saavedra, JA Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akolkar, NN Al Khoury, K Alberghi, GL Albert, J Albicocco, P Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Alhroob, M Ali, B Ali, S Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amor Dos Santos, SP Amos, KR Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Antrim, DJA Anulli, F Aoki, M Aoki, T Aparisi Pozo, JA Aparo, MA Aperio Bella, L Appelt, C Aranzabal, N Araujo Ferraz, V Arcangeletti, C Arce, ATH https://escholarship.org/uc/item/1066f0pc The first measurement of the magnitude of the CKM quark mixing matrix element |Vcb| using on-shell W-boson decays is presented. The measurement is made with tt¯$$ t\overline{t} $$ events from pp collision data corresponding to an integrated luminosity of 140 fb−1 at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. A value of:Vcb=50−14+11×10−3$$ \left|{V}_{cb}\right|=\left({50}_{-14}^{+11}\right)\times {10}^{-3} $$is measured, where the uncertainties have roughly equal contributions from the limited size of the data sample and from systematic effects. This is consistent with existing measurements made at much lower energy scales in B hadron decays. While the sensitivity does not yet rival that of previous determinations, this novel approach probes a very different physical situation, namely the rare hadronic t→bb¯c$$ t\to b\overline{b}c $$ decay at high momentum-transfer, rather than semileptonic B decays at low momentum-transfer. https://escholarship.org/uc/item/1066f0pc Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Aperio Bella, L Apicella, M Appelt, C Apyan, A Arampatzi, M Arbiol Val, SJ https://escholarship.org/uc/item/0wb846ht This Letter presents a measurement of prompt charged-particle production in proton-oxygen interactions at center-of-mass energy with the ATLAS detector, corresponding to of integrated luminosity. A total of selected events have at least one track with transverse momentum and pseudorapidity . The measured fiducial proton-oxygen cross section is and the extrapolated inelastic proton-air cross section is . Measurements of charged-particle multiplicity, , and distributions are an order-of-magnitude more precise than differences between hadronic-interaction models. These results enable improved modeling of cosmic-ray air showers, which is important for astroparticle physics. https://escholarship.org/uc/item/0wb846ht Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Ackerschott, J Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio Apicella, M Appelt, C Apyan, A Arampatzi, M https://escholarship.org/uc/item/09f6v2jj A search is performed for the electroweak pair production of charginos and associated production of a chargino and neutralino, each of which decays through an -parity-violating coupling into a lepton and a , , or Higgs boson. This search targets the Higgs boson decay channel of the charginos and neutralinos, using events with three or more -tagged jets and one or two electrons or muons. The analyzed data corresponds to an integrated luminosity of and of proton-proton collision data produced by the Large Hadron Collider at center-of-mass energies of and , respectively, collected by the ATLAS experiment between 2015 and 2023. The data are found to be consistent with predictions from the Standard Model. The results are interpreted as limits at 95%&nbsp;confidence level on model-independent cross sections for processes beyond the Standard Model. Limits are also set on the production of charginos and neutralinos for a minimal supersymmetric Standard Model with an additional... https://escholarship.org/uc/item/09f6v2jj Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Ackerschott, J Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio Apicella, M Appelt, C Apyan, A Arampatzi, M https://escholarship.org/uc/item/06w55556 After ten years of operation at the LHC, the planar pixel sensors of the innermost barrel layer of the ATLAS Pixel detector have accumulated an average bulk damage fluence in excess of 2×1015 1 MeV-neutrons equivalent/cm2. The macroscopic effects of this radiation are an increase of the sensor leakage current, a loss of charge collection efficiency and an increase of the depletion voltage. Using regular bias voltage scans performed at the beginning and end of each data taking campaign the evolution of the pixel cluster charge and bulk depletion is studied as a function of particle fluence. Results are interpreted with the modelling provided by standalone TCAD and ATLAS Monte Carlo simulation including radiation damage effects. The dependence of the collected charge and the depletion voltage with integrated luminosity are studied through the full period of operation. https://escholarship.org/uc/item/06w55556 Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Ackerschott, J Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Almazan, ER Aloisio, A Alonso, F Alpigiani, C Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Bella, L Aperio Apicella, M Appelt, C Apyan, A Arampatzi, M https://escholarship.org/uc/item/06s4w4x6 The data collected by the ATLAS experiment during the 2015 Pb+Pb and 2017 Xe+Xe LHC runs offer new opportunities to study charged particle azimuthal anisotropy. The high-statistics Pb+Pb sample allows for a detailed study of the azimuthal anisotropy of produced particles. This should improve the understanding of initial conditions of nuclear collisions, hydrodynamical behavior of quark-gluon plasma and parton energy loss. New ATLAS measurements of differential and global Fourier harmonics of charged particles (ν n ) in 5.02 TeV Pb+Pb and 5.44 TeV Xe+Xe collisions in a wide range of transverse momenta, pseudorapidity (|η| &lt; 2.5) and collision centrality are presented. The higher order harmonics, sensitive to fluctuations in the initial state, are measured up to n = 7 using the two-particle correlation, cumulant and scalar product methods. The dynamic properties of QGP are studied using a recently-proposed modified Pearson's correlation coefficient, ρ ( ν n 2 , p T ) , between... https://escholarship.org/uc/item/06s4w4x6 Wed, 30 Sep 2026 00:00:00 +0000 Bold, Tomasz Collaboration, ATLAS https://escholarship.org/uc/item/0161k66j Measurements of inclusive, differential cross-sections for the production of events with missing transverse momentum in association with jets in proton-proton collisions at s$$ \sqrt{s} $$ = 13 TeV are presented. The measurements are made with the ATLAS detector using an integrated luminosity of 140 fb−1 and include measurements of dijet distributions in a region in which vector-boson fusion processes are enhanced. They are unfolded to correct for detector resolution and efficiency within the fiducial acceptance, and are designed to allow robust comparisons with a wide range of theoretical predictions. A measurement of differential cross sections for the Z → νν process is made. The measurements are generally well-described by Standard Model predictions except for the dijet invariant mass distribution. Auxiliary measurements of the hadronic system recoiling against isolated leptons, and photons, are also made in the same phase space. Ratios between the measured distributions are... https://escholarship.org/uc/item/0161k66j Wed, 30 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Agarwala, J Aggarwal, A Agheorghiesei, C Ahmad, A Ahmadov, F Ahmed, WS Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Aizenberg, I Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Al Khoury, K Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JF Allendes Flores, CA Allport, PP Aloisio, A Alonso, F Alpigiani, C Alvarez Estevez, M Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amidei, D Amirie, KJ Amor Dos Santos, SP Amos, KR An, S Ananiev, V Anastopoulos, C Andeen, T Anders, JK Andrean, SY Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M https://escholarship.org/uc/item/9075h84k The Milky Way Backup Program (MWBP), a survey currently underway with the Dark Energy Spectroscopic Instrument (DESI) on the Nicholas U. Mayall 4 m Telescope, works at the margins of the DESI Main surveys to obtain spectra of millions of additional stars from the Gaia catalog. Efficiently utilizing times between ∼12° and 18° twilight and poor weather conditions, the MWBP extends the range of stellar sources studied to both brighter magnitudes and lower Galactic latitude and declination than the stars studied in DESI’s Main Milky Way Survey. While the MWBP prioritizes candidate giant stars selected from the Gaia catalog (using color and parallax criteria), it also includes an unbiased sample of bright stars (i.e., 11.2 ≲ G &lt; 16 mag) as well as fainter sources (to G ≲ 19 mag). As of 2025 March 1, the survey had obtained spectra of ∼7 million stars, approximately 1.2 million of which are included in the DESI Data Release 1. The DESI spectra cover the wavelength range from 3600... https://escholarship.org/uc/item/9075h84k Tue, 29 Sep 2026 00:00:00 +0000 Dey, Arjun Koposov, Sergey E Najita, Joan R Cooper, Andrew P Gänsicke, BT Myers, Adam D Raichoor, A https://orcid.org/0000-0001-5999-7923 Eisenstein, Daniel J Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D https://orcid.org/0000-0002-5042-5088 Prieto, C Allende Beraldo e Silva, Leandro Li, Ting S Valluri, M Juneau, Stéphanie Lambert, Mika Li, S Thomas, Guillaume F Wang, Wenting Riley, Alexander H Kizhuprakkat, N Aguilar, J Ahlen, S Bailey, S https://orcid.org/0000-0003-4162-6619 Bianchi, D Brooks, D Claybaugh, T https://orcid.org/0000-0002-5024-6987 Cuceu, A https://orcid.org/0000-0002-2169-0595 de la Macorra, A Della Costa, J Dey, Biprateep Doel, P Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Honscheid, K Ishak, M Jimenez, J Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lamman, C Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Meisner, A Miquel, R Moustakas, J Nadathur, S Palanque-Delabrouille, N Percival, WJ Pérez-Ràfols, I Prada, F Rossi, G Sanchez, E Schubnell, M Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Weaver, BA Wechsler, RH Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/867528n7 We implement Crossing Statistics to reconstruct in a model-agnostic manner the expansion history of the universe and properties of dark energy, using DESI Data Release 1 (DR1) BAO data in combination with one of three different supernova compilations (PantheonPlus, Union3, and DES-SN5YR) and Planck CMB observations. Our results hint towards an evolving and emergent dark energy behaviour, with negligible presence of dark energy at z ≳ 1, at varying significance depending on data sets combined. In all these reconstructions, the cosmological constant lies outside the 95% confidence intervals for some redshift ranges. This dark energy behaviour, reconstructed using Crossing Statistics, is in agreement with results from the conventional w 0–w a dark energy equation of state parametrization reported in the DESI Key cosmology paper. Our results add an extensive class of model-agnostic reconstructions with acceptable fits to the data, including models where cosmic acceleration slows down... https://escholarship.org/uc/item/867528n7 Tue, 29 Sep 2026 00:00:00 +0000 Calderon, R Lodha, K Shafieloo, A Linder, E Sohn, W de Mattia, A Cervantes-Cota, JL Crittenden, R Davis, TM Ishak, M Kim, AG https://orcid.org/0000-0001-6315-8743 Matthewson, W Niz, G Park, S Aguilar, J Ahlen, S Allen, S Brooks, D Claybaugh, T https://orcid.org/0000-0002-5024-6987 de la Macorra, A Dey, A Dey, B Doel, P Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Honscheid, K Howlett, C Juneau, S Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Miquel, R Moustakas, J Newman, JA Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Rezaie, M Rossi, G Ruhlmann-Kleider, V Sanchez, E Schlegel, D https://orcid.org/0000-0002-5042-5088 Schubnell, M Seo, H Sprayberry, D Tarlé, G Taylor, P Vargas-Magaña, M Weaver, BA Zarrouk, P Zou, H https://escholarship.org/uc/item/5qg0r2mb The ATLAS detector at the Large Hadron Collider reads out particle collision data from over 100 million electronic channels at a rate of approximately 100 kHz, with a recording rate for physics events of approximately 1 kHz. Before being certified for physics analysis at computer centres worldwide, the data must be scrutinised to ensure they are clean from any hardware or software related issues that may compromise their integrity. Prompt identification of these issues permits fast action to investigate, correct and potentially prevent future such problems that could render the data unusable. This is achieved through the monitoring of detector-level quantities and reconstructed collision event characteristics at key stages of the data processing chain. This paper presents the monitoring and assessment procedures in place at ATLAS during 2015–2018 data-taking. Through the continuous improvement of operational procedures, ATLAS achieved a high data quality efficiency, with 95.6%... https://escholarship.org/uc/item/5qg0r2mb Tue, 29 Sep 2026 00:00:00 +0000 Aad, G Abbott, B Abbott, DC Abud, A Abed Abeling, K Abhayasinghe, DK Abidi, SH AbouZeid, OS Abraham, NL Abramowicz, H Abreu, H Abulaiti, Y Acharya, BS Achkar, B Adachi, S Adam, L Bourdarios, C Adam Adamczyk, L Adamek, L Adelman, J Adersberger, M Adiguzel, A Adorni, S Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agapopoulou, C Agaras, MN Aggarwal, A Agheorghiesei, C Aguilar-Saavedra, JA Ahmadov, F Ahmed, WS Ai, X Aielli, G Akatsuka, S Åkesson, TPA Akilli, E Akimov, AV Al Khoury, K Alberghi, GL Albert, J Verzini, MJ Alconada Alderweireldt, S Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, A Alfonsi, F Alhroob, M Ali, B Aliev, M Alimonti, G Alkire, SP Allaire, C Allbrooke, BMM Allen, BW Allport, PP Aloisio, A Alonso, F Alpigiani, C Alshehri, AA Estevez, M Alvarez Alviggi, MG Coutinho, Y Amaral Ambler, A Ambroz, L Amelung, C Amidei, D Dos Santos, SP Amor Amoroso, S Amrouche, CS An, F Anastopoulos, C Andari, N Andeen, T Anders, CF Anders, JK Andreazza, A Andrei, V Anelli, CR Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Anthony, MT Antipov, E Antonelli, M Antrim, DJA Anulli, F Aoki, M Pozo, JA Aparisi Bella, L Aperio Araque, JP Ferraz, V Araujo Pereira, R Araujo Arcangeletti, C Arce, ATH https://escholarship.org/uc/item/9cx6h5sc At the Large Hadron Collider, the WbWb final state is expected to be dominated by tt¯$$ t\overline{t} $$ production with a contribution from single-top processes. Differential cross-sections for WbWb production in the dilepton decay channel are measured at the particle level as a function of various kinematic variables. The analysis is based on data from proton-proton collisions at a centre-of-mass energy of s=13$$ \sqrt{s}=13 $$ TeV, recorded by the ATLAS detector at the Large Hadron Collider over the period from 2015 to 2018, corresponding to an integrated luminosity of 140 fb−1. Measurements are performed within the fiducial phase-space defined by the presence of two b-jets and one electron and one muon of opposite charges. The differential cross-sections are corrected for detector effects and unfolded to the particle level. Results are compared with predictions from Monte Carlo event generators at next-to-leading order in perturbative quantum chromodynamics; overall the measurements... https://escholarship.org/uc/item/9cx6h5sc Mon, 21 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abulaiti, Y Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmadov, F Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JS Allen, JF Allport, PP Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amezza, T Amidei, D Amini, B Amirie, K Amirkhanov, A Amor Dos Santos, SP Amos, KR Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T https://escholarship.org/uc/item/6ns2r370 The substantial data volumes encountered in modern particle physics and other domains of fundamental physics research allow (and require) the use of increasingly complex data analysis tools and workflows. While the use of machine learning (ML) tools for data analysis has recently proliferated, these tools are typically special-purpose algorithms that rely, for example, on encoded physics knowledge to reach optimal performance. In this work, we investigate a new and orthogonal direction: Using recent progress in large language models (LLMs) to create a team of agents — instances of LLMs with specific subtasks — that jointly solve data analysis-based research problems in a way similar to how a human researcher might: by creating code to operate standard tools and libraries (including ML systems) and by building on results of previous iterations. If successful, such agent-based systems could be deployed to automate routine analysis components to counteract the increasing complexity... https://escholarship.org/uc/item/6ns2r370 Mon, 21 Sep 2026 00:00:00 +0000 Diefenbacher, Sascha Hallin, Anna Kasieczka, Gregor Krämer, Michael Lauscher, Anne Lukas, Tim https://escholarship.org/uc/item/2c02x4vs Recent baryonic acoustic oscillation (BAO) measurements from the Dark Energy Spectroscopic Instrument (DESI) are mildly discrepant (2.2σ) with the cosmic microwave background (CMB) when interpreted within ΛCDM. When analyzing these data with extended cosmologies this inconsistency manifests as a ≃3σ preference for subminimal neutrino mass or evolving dark energy. It is known that the preference for subminimal neutrino mass from the suppression of structure growth could be alleviated by increasing the optical depth to reionization τ. We show that, because the CMB-inferred τ is negatively correlated with the matter fraction, a larger optical depth resolves a similar preference from geometric constraints. Optical depths large enough to resolve the neutrino mass tension (τ∼0.09) reduce the preference for evolving dark energy from ≃3σ to ≃1.5σ and increase the CMB-inferred values of n_{s} and H_{0} to 0.968±0.004 and 67.94±0.44  km/s/Mpc, respectively. Conversely, within ΛCDM the combination... https://escholarship.org/uc/item/2c02x4vs Mon, 21 Sep 2026 00:00:00 +0000 Sailer, Noah Farren, Gerrit S https://orcid.org/0000-0001-5704-1127 Ferraro, Simone https://orcid.org/0000-0003-4992-7854 White, Martin https://orcid.org/0000-0001-9912-5070 https://escholarship.org/uc/item/2tr5f798 This paper reports the observation of electroweak diboson (WW/WZ/ZZ) production in association with a high-mass dijet system, in which final states with one boson decaying leptonically and the other boson decaying hadronically are studied. The hadronically decaying W/Z boson is reconstructed as either two small-radius jets or one large-radius jet with jet substructure requirements. The data analyzed correspond to an integrated luminosity of 140fb-1$$140 \ \text {fb}^{-1}$$ of proton–proton collisions at a center-of-mass energy of s=13$$\sqrt{s}=13$$ TeV collected with the ATLAS detector during the 2015-2018 data taking at the Large Hadron Collider. The electroweak production of WW/WZ/ZZ in association with two jets is observed in a phase space dominated by vector-boson scattering with a significance of 7.4σ$$7.4\sigma $$ (expected 6.1σ$$6.1\sigma $$) and the signal strength is determined to be 1.28-0.21+0.23$$1.28^{+0.23}_{-0.21}$$. The corresponding production cross section in... https://escholarship.org/uc/item/2tr5f798 Fri, 18 Sep 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abulaiti, Y Acharya, BS Ackermann, A Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmadov, F Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Aitbenchikh, B Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JS Allen, JF Allport, PP Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Ambler, A Amelung, C Amerl, M Ames, CG Amezza, T Amidei, D Amini, B Amirie, K Amirkhanov, A Santos, SP Amor Dos Amos, KR Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T https://escholarship.org/uc/item/1xm4z509 We describe a technique for spectrograph stabilization useful when conventional mitigation techniques of vacuum tanks, thermal insulation, and laser frequency comb may be impractical, expensive, heavy, or bulky. This includes spectrographs on airborne platforms or mounted on telescopes where they suffer a changing gravity vector or other drifts. Placing a fixed-delay interferometer in series with a spectrograph forms an externally dispersed interferometer (EDI). This produces a uniform sinusoidal comb multiplying input spectrum, creating (through heterodyning) beats (moiré patterns). In Fourier space for low frequencies up to the comb frequency, the moiré generated signal counter-rotates to ordinary spectra under an unknown disperser wavenumber drift Δx. This generates a large negative feedback signal useful in a conceptual control loop, to converge rapidly to a stable spectrum and yield Δx. A modified EDI data analysis algorithm (“crossfading”) combines frequency-weighted moiré... https://escholarship.org/uc/item/1xm4z509 Fri, 18 Sep 2026 00:00:00 +0000 Erskine, David J Edelstein, Jerry Wishnow, Edward H Sirk, Martin M Linder, Eric V Fratanduono, Dayne E https://escholarship.org/uc/item/9kr6k95j We present ABCMB, a differentiable Einstein-Boltzmann solver for the cosmic microwave background (CMB). ABCMB is an analysis-ready code package capturing important effects to linear order in ΛCDM cosmology. It computes the CMB power spectrum and includes effects like lensing, polarization, massive neutrinos, and a state-of-the-art treatment of Big Bang Nucleosynthesis and recombination. ABCMB has sub-percent-level agreement with CLASS and can be run on a GPU with competitive, and sometimes even faster, run times, owing to ABCMB's favorable run time scaling with maximum multipole moment. It is refactored compared to previous codes and takes advantage of object-oriented programming to improve extensibility, meaning new physics can be added to it without the need for modifying source files. ABCMB provides accurate and stable gradients to the user, making Fisher analyses straightforward, and enabling the use of efficient gradient-based sampling methods. https://escholarship.org/uc/item/9kr6k95j Wed, 16 Sep 2026 00:00:00 +0000 Zhou, Zilu Giovanetti, Cara Liu, Hongwan https://escholarship.org/uc/item/78t4810q We present the cosmological analysis of the one-dimensional Lyman-α flux power spectrum from the first data release of the Dark Energy Spectroscopic Instrument (DESI). We capture the dependence of the signal on cosmology and intergalactic medium physics using an emulator trained on a cosmological suite of hydrodynamical simulations, and we correct its predictions for the impact of astrophysical contaminants and systematics, many of these not considered in previous analyses. We employ this framework to constrain the amplitude and logarithmic slope of the linear matter power spectrum at k ★ = 0.009 km-1s and redshift z = 3, obtaining Δ2 ★ = 0.379 ± 0.032 and n ★ = -2.309 ± 0.019 https://github.com/igmhub/cobaya_lya_p1d. The robustness of these constraints is validated through the analysis of mocks and a large number of alternative data analysis variations, with cosmological parameters kept blinded throughout the validation process. We then combine our results with constraints from... https://escholarship.org/uc/item/78t4810q Wed, 16 Sep 2026 00:00:00 +0000 Chaves-Montero, J Font-Ribera, A McDonald, P https://orcid.org/0000-0001-8346-8394 Armengaud, E Chebat, D Garcia-Quintero, C Karaçaylı, NG Ravoux, C Satyavolu, S Schöneberg, N Walther, M Aguilar, J Ahlen, S Bailey, S https://orcid.org/0000-0003-4162-6619 Bianchi, D Brooks, D Claybaugh, T https://orcid.org/0000-0002-5024-6987 Cuceu, A https://orcid.org/0000-0002-2169-0595 de la Macorra, A Doel, P Ferraro, S https://orcid.org/0000-0003-4992-7854 Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gonzalez-Morales, AX Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Herrera-Alcantar, HK Honscheid, K Ishak, M Joyce, R Juneau, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kremin, A https://orcid.org/0000-0001-6356-7424 Lahav, O Lamman, C Landriau, M https://orcid.org/0000-0003-1838-8528 Le Goff, JM Le Guillou, L Leauthaud, A Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Meisner, A Miquel, R Moustakas, J Nadathur, S Niz, G Palanque-Delabrouille, N Percival, WJ Prada, F Pérez-Ràfols, I Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tan, T Tarlé, G Weaver, BA Yèche, C Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/6k7413nd Cosmological studies of the Lyman-α (Ly-α) forest typically constrain parameters using two-point statistics. However, higher-order statistics, such as the three-point function (or its Fourier counterpart, the bispectrum) offer additional information and help break the degeneracy between the mean flux and power spectrum amplitude, albeit at a significant computational cost. To address this, we extend an existing highly informative compression of the bispectrum, the skew spectra, to the Ly-α forest. We derive the tree-level bispectrum of Ly-α forest fluctuations in the framework of effective field theory directly in redshift space and validate our methodology on two mock datasets: (i) synthetic three-dimensional (3D) Ly-α fields using second-order perturbation theory and (ii) large Ly-α forest mocks constructed from the N-body simulation suite abacussummit. We measure the three-dimensional anisotropic cross-spectra between the transmitted flux fraction and all quadratic operators... https://escholarship.org/uc/item/6k7413nd Wed, 16 Sep 2026 00:00:00 +0000 de Belsunce, Roger Sullivan, James M McDonald, Patrick https://orcid.org/0000-0001-8346-8394 https://escholarship.org/uc/item/5pg6569s I show that early-time (pre-recombination) solutions to the Hubble tension are generically expected to increase the preferred baryon density ωb . This puts these models in tension with Big Bang Nucleosynthesis (BBN), as measurements of primordial deuterium constrain ωb at percent level. I show that existing analyses are in tension with the BBN determination of ωb , and that including a likelihood component for primordial deuterium deters two representative models from recovering a high H0 . https://escholarship.org/uc/item/5pg6569s Wed, 16 Sep 2026 00:00:00 +0000 Giovanetti, Cara https://escholarship.org/uc/item/9nb586kg We report results from searches for new physics models through electron recoils using data collected by the LUX-ZEPLIN experiment during its first two science runs, with a total exposure of 4.2  tonne-years. The observed data are consistent with a background-only hypothesis. Constraints are derived for electromagnetic interactions of solar neutrinos, solar axionlike particles (ALPs), mirror dark matter, and the absorption of bosonic dark matter candidates. The inverse Primakoff process for ^{57}Fe deexcitation solar ALPs is considered for the first time. These results represent the most stringent constraints to date on keV-scale Primakoff and ^{57}Fe solar ALPs, bosonic dark matter, mirror dark matter, and neutrino millicharge, while remaining competitive for the other signal models investigated. https://escholarship.org/uc/item/9nb586kg Tue, 15 Sep 2026 00:00:00 +0000 Akerib, DS Al Musalhi, AK Alder, F Almquist, J Amarasinghe, CS Ames, A Anderson, TJ https://orcid.org/0000-0002-7113-6840 Angelides, N Araújo, HM Armstrong, JE Arthurs, M Baker, A Balashov, S Bang, J Bargemann, JW Barillier, EE Beattie, K Benson, T Bhatti, A Biesiadzinski, TP Birch, HJ Bishop, E Blockinger, GM Boxer, B Brew, CAJ Brás, P Burdin, S Carmona-Benitez, MC Carter, M Chawla, A Chen, H Chin, YT Chott, NI Contreras, S Converse, MV Coronel, R Cottle, A Cox, G Curran, D Dahl, CE Darlington, I Dave, S David, A Delgaudio, J Dey, S de Viveiros, L Di Felice, L Ding, C Dobson, JEY Druszkiewicz, E Dubey, S Dunbar, CL Eriksen, SR Fan, A Fearon, NM Fieldhouse, N Fiorucci, S Flaecher, H Fraser, ED Fruth, TMA Gaitskell, RJ Geffre, A Genovesi, J Ghag, C Ghosh, A Gibbons, R Gokhale, S Green, J van der Grinten, MGD Haiston, JJ Hall, CR Hall, T Hartigan-O’Connor, E Haselschwardt, SJ Hernandez, MA Hertel, SA Homenides, GJ Horn, M Huang, DQ Hunt, D Jacquet, E James, RS Jenkins, K Kaboth, AC Kamaha, AC Kannichankandy, MK Khaitan, D Khazov, A Kim, J Kim, YD Kingston, J Kodroff, D https://orcid.org/0000-0001-6095-2714 Korolkova, EV Kraus, H Kravitz, S Kreczko, L Kudryavtsev, VA Lawes, C Leonard, DS Lesko, KT https://orcid.org/0000-0002-0149-5231 https://escholarship.org/uc/item/8dp158fg Vapor-solid (VS) growth presents a robust alternative to vapor-liquid-solid (VLS) techniques for the fabrication of nanowires (NWs), particularly in applications involving doping, accurate control of composition and heterointerfaces and formation of high-uniformity NW arrays. Despite many obvious advantages, surprisingly few efforts have been undertaken to establish VS growth of GaAs-based NWs, especially in molecular beam epitaxy (MBE) growth. This review encompasses recent developments and breakthroughs in catalyst-free VS growth of GaAs-based NWs through selective-area MBE. It emphasizes the significance of template design on NW characteristics and examines the important roles of twin defects, growth facets, dopants and dilute group-V species, such as silicon (Si) and antimony (Sb) on growth dynamics, adatom diffusion, and crystal phase purity. Si doping emerges as a critical factor in stabilizing twin defects, improving axial growth, NW uniformity, and n-type conduction in... https://escholarship.org/uc/item/8dp158fg Tue, 15 Sep 2026 00:00:00 +0000 Esmaielpour, Hamidreza Jeong, Hyowon W https://orcid.org/0000-0002-1454-6069 Döblinger, Markus Ajay, Akhil Ruhstorfer, Daniel Finley, Jonathan Koblmüller, Gregor https://escholarship.org/uc/item/7z13442r GaAs-based nanowires hosting active quantum heterostructures provide a promising route toward monolithic integration of single-photon sources on silicon, a key requirement for scalable quantum photonics. However, ultrathin axial quantum-emitter formation is often hindered by facet-dependent growth dynamics and rotational twins, which induce lateral overgrowth and compromise interface abruptness. Here, we develop InGaAs-based quantum emitters by tailoring facet evolution via dilute Sb incorporation, which efficiently suppresses twins and promotes confined axial insertion at the growth-front facet. This approach significantly enhances the probability of obtaining abrupt, few-nanometer-thin quantum dots at the nanowire tip. Single-nanowire optical spectroscopy reveals intense, spatially localized emission from the active region with lifetimes as short as (0.51 ± 0.02) ns, and second-order photon-correlation measurements consistently exhibit pronounced antibunching with <i>g</i>⁽²⁾(0)... https://escholarship.org/uc/item/7z13442r Tue, 15 Sep 2026 00:00:00 +0000 Jeong, Hyowon W https://orcid.org/0000-0002-1454-6069 Koulas-Simos, Aris Limame, Imad Döblinger, Markus Kim, Sang Kyu Palekar, Chirag C Finley, Jonathan J Reitzenstein, Stephan Koblmüller, Gregor https://escholarship.org/uc/item/1g6012ds DUNE (Deep Underground Neutrino Experiment) is a long-baseline neutrino oscillation experiment currently under construction, whose far detectors will be the largest liquid argon time projection chambers ever built. This detector design calls for custom-built cryogenic front-end electronics to meet its performance requirements. This paper describes the charge readout electronics that will be used in the DUNE horizontal drift (HD) far detector and presents performance results using data from the ProtoDUNE-HD detector, a 770 ton liquid argon time projection chamber operated at the CERN Neutrino Platform in 2024 that served as the final prototype of the DUNE HD design. https://escholarship.org/uc/item/1g6012ds Tue, 15 Sep 2026 00:00:00 +0000 Abbaslu, S Alrahman, F Abd Abud, A Abed Acciarri, R Accorsi, LP Acero, MA Adames, MR Adamov, G Adamowski, M Adhikari, K Adriano, C Agudelo-Jaramillo, K Akbar, F Alemanno, F Alex, NS Soplin, L Aliaga Alqaisi, A Alrashed, M Alton, A Alvarez, R Alves, T Aman, A Amar, H Amarinei, R Amedo, P Amorim, EPM Anderson, J Andrade, DA Andreopoulos, C Andreotti, M Andrews, MP Andrianala, F Andringa, S Anjarazafy, F Ansarifard, S Antic, D Antonakis, A Aranda-Fernandez, A Araya-Santander, T Arellano, L Diaz, E Arrieta Arroyave, MA Pons, M Artero Asaadi, J Ascencio, M Ashkenazi, A Asquith, L Atkin, E Auguste, D Aurisano, A Aushev, V Autiero, D Gómez, D Ávila Azam, MB Azfar, F Back, JJ Bae, Y Bagaturia, I Bagby, L Bagdu, H Balasubramanian, S Balboni, A Baldi, P https://orcid.org/0000-0003-0636-7930 Baldini, W Baldo, E Baldonedo, J Baller, B Bambah, B Barao, F Barbu, D Barenboim, G Alzás, P Barham Barker, GJ Barkhouse, W Yucel, E Barlas Barr, G Barrett, W Barrow, D Barrow, JL Basharina-Freshville, A Bashyal, A Basque, V Bassani, M Basu, D Bathe-Peters, L Sigolo, JG Batista Battat, JBR Battisti, F Bautista, J Bay, F Alba, JLL Bazo Beacom, JF Bechetoille, E Beever, A Behera, B Belchior, E Bell, B Bell, G Bellantoni, L Bellettini, G https://escholarship.org/uc/item/1fc4c0qm We present searches for light dark matter (DM) with masses 3-9  GeV/c^{2} in the presence of coherent elastic neutrino-nucleus scattering (CEνNS) from ^{8}B solar neutrinos with the LUX-ZEPLIN experiment. This analysis uses a 5.7&nbsp;tonne-yr exposure with data collected between March 2023 and April 2025. In an energy range spanning 1-6&nbsp;keV, we report no significant excess of events attributable to dark matter nuclear recoils, but we observe a significant signal from ^{8}B CEνNS interactions that is consistent with expectation. We set world-leading limits on spin-independent and spin-dependent-neutron DM-nucleon interactions for masses down to 5  GeV/c^{2}. In the no-dark-matter scenario, we observe a signal consistent with ^{8}B CEνNS events, corresponding to a 4.5σ statistical significance. This is the most significant evidence of ^{8}B CEνNS interactions and is enabled by robust background modeling and mitigation techniques. This demonstrates LZ's ability to detect rare... https://escholarship.org/uc/item/1fc4c0qm Tue, 15 Sep 2026 00:00:00 +0000 Akerib, DS Al Musalhi, AK Alder, F Almquist, BJ Amarasinghe, CS Ames, A Anderson, TJ https://orcid.org/0000-0002-7113-6840 Angelides, N Araújo, HM Armstrong, JE Arthurs, M Baker, A Balashov, S Bang, J Bargemann, JW Barillier, EE Barthel, J Bauer, D Beattie, K Bhatti, A Biesiadzinski, TP Birch, HJ Bishop, E Blockinger, GM Brew, CAJ Brás, P Burdin, S Carmona-Benitez, MC Carter, M Chawla, A Chen, H Chin, YT Chott, NI Contreras, S Converse, MV Coronel, R Cottle, A Cox, G Curran, D Dahl, CE Darlington, I Dave, S David, A Davis, J Delgaudio, J Dey, S de Viveiros, L Di Felice, L Ding, C Dobson, JEY Druszkiewicz, E Dubey, S Dunbar, CL Eriksen, SR Fayer, S Fearon, NM Fieldhouse, N Fiorucci, S Flaecher, H Fraser, ED Fruth, TMA Gaemers, PW Gaitskell, RJ Geffre, A Genovesi, J Ghag, C Ghamsari, J Ghosh, A Ghosh, S Gibbons, R Gokhale, S Green, J van der Grinten, MGD Haiston, JJ Hall, CR Hall, T Hampp, RN Haselschwardt, SJ Hernandez, MA Hertel, SA Homenides, GJ Horn, M Huang, DQ Hunt, D Jacquet, E James, RS Jenkins, K Kaboth, AC Kamaha, AC Kannichankandy, MK Khaitan, D Khazov, A Kim, J Kim, YD Kodroff, D https://orcid.org/0000-0001-6095-2714 Korolkova, EV Kraus, H Kravitz, S Kreczko, L Kudryavtsev, VA https://escholarship.org/uc/item/07h6x7q5 The LUX-ZEPLIN (LZ) experiment aims to detect rare interactions between dark matter particles and xenon. Although the detector is designed to be the most sensitive to GeV/c2–TeV/c2 weakly interacting massive particles (WIMPs), it is also capable of measuring low-energy ionization signals down to a single electron that may be produced by scatters of sub-GeV/c2 dark matter. The major challenge in exploiting this sensitivity is to understand and suppress the ionization background in the few-electron regime. We report a characterization of the delayed electron backgrounds following energy depositions in the LZ detector under different detector conditions. In addition, we quantify the probability for photons to be emitted in coincidence with electron emission from the high voltage grids. We then demonstrate that spontaneous grid electron emission can be identified and rejected with a high efficiency using a coincident photon tag, which provides a tool to improve the sensitivity of... https://escholarship.org/uc/item/07h6x7q5 Tue, 15 Sep 2026 00:00:00 +0000 Akerib, DS Al Musalhi, AK Alder, F Almquist, BJ Amarasinghe, CS Ames, A Anderson, TJ https://orcid.org/0000-0002-7113-6840 Angelides, N Araújo, HM Armstrong, JE Arthurs, M Baker, A Balashov, S Bang, J Bargemann, JW Barillier, EE Beattie, K Benson, T Bhatti, A Biesiadzinski, TP Birch, HJ Bishop, E Blockinger, GM Boxer, B Brew, CAJ Brás, P Burdin, S Carmona-Benitez, MC Carter, M Chawla, A Chen, H Chin, YT Chott, NI Contreras, S Converse, MV Coronel, R Cottle, A Cox, G Curran, D Dahl, CE Darlington, I Dave, S David, A Delgaudio, J Dey, S de Viveiros, L Di Felice, L Ding, C Dobson, JEY Druszkiewicz, E Dubey, S Dunbar, CL Eriksen, SR Fan, A Fearon, NM Fieldhouse, N Fiorucci, S Flaecher, H Fraser, ED Fruth, TMA Gaitskell, RJ Geffre, A Genovesi, J Ghag, C Ghosh, A Ghosh, S Gibbons, R Gokhale, S Green, J van der Grinten, MGD Haiston, JJ Hall, CR Hall, T Haselschwardt, SJ Hernandez, MA Hertel, SA Homenides, GJ Horn, M Huang, DQ Hunt, D Jacquet, E James, RS Jenkins, K Kaboth, AC Kamaha, AC Kannichankandy, MK Khaitan, D Khazov, A Kim, J Kim, YD Kingston, J Kodroff, D Korolkova, EV Kraus, H Kravitz, S Kreczko, L Kudryavtsev, VA Lawes, C Leonard, DS Lesko, KT https://orcid.org/0000-0002-0149-5231 https://escholarship.org/uc/item/5wr6j7w1 We present the discovery of SN 2025mkn, a gravitationally lensed Type II supernova. First detected as a blue transient in Zwicky Transient Facility (ZTF), 0 .″ 83 from a z = 0.42 elliptical galaxy, the follow-up SNIFS/UH2.2 m and LRIS/Keck spectra revealed absorption lines at z = 1.371. Later JWST NIRCam imaging shows that the bright transient is a close pair of point sources separated by ∼0.″07 , and a 30 times fainter counterimage opposite the lens, for which NIRSpec reveals strong Hα emission also at z = 1.371. The lightcurves and spectra are consistent with the Type II supernova source being magnified ≳100 times, with ∼250 required to reconcile its luminosity with that of nearby events such as SN 2023ixf. Lens models are consistent with such high magnifications, and always show that the faint image arrived first (undetected in earlier ZTF imaging), consistent with the later spectral phase of this fainter image. A fourth image is also predicted and possibly detected in the... https://escholarship.org/uc/item/5wr6j7w1 Tue, 1 Sep 2026 00:00:00 +0000 Lemon, Cameron Goobar, Ariel Johansson, Joel Mörtsell, Edvard Schulze, Steve Andreoni, Igor Bochenek, Aleksandra Brennan, Seán J Busmann, Malte Coughlin, Michael Das, Kaustav K Dhawan, Suhail Fremling, Christoffer Gangopadhyay, Anjasha Gruen, Daniel Hall, Xander J Ho, Anna YQ Kasliwal, Mansi M Perley, Daniel A Rigault, Mickael Schroeder, Genevieve Smith, Mathew Sollerman, Jesper Somalwar, Jean J Stein, Robert Thorp, Stephen Townsend, Alice Wise, Jacob L Yan, Lin Arendse, Nikki Bellm, Eric C Chen, Tracy X Drake, Andrew Masci, Frank J Purdum, Josiah Smith, Roger Hinkle, Jason T Rivera-Thorsen, T Emil Shappee, Benjamin J Tucker, Michael A Aguilar, Jessica Ahlen, Steven Aldering, Greg BenZvi, Segev Bianchi, Davide Brooks, David Claybaugh, Todd https://orcid.org/0000-0002-5024-6987 de la Macorra, Axel Della Costa, John Dey, Arjun Doel, Peter Flaugher, Brenna Font-Ribera, Andreu Forero-Romero, Jaime E Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Huterer, Dragan Ishak, Mustapha Jimenez, Jorge Joyce, Dick Juneau, Stephanie Kehoe, Robert Kim, Alex G https://orcid.org/0000-0001-6315-8743 Kirkby, David https://orcid.org/0000-0002-8828-5463 Kisner, Theodore Kremin, Anthony https://orcid.org/0000-0001-6356-7424 Lahav, Ofer Landriau, Martin https://orcid.org/0000-0003-1838-8528 Le Guillou, Laurent Levi, Michael E https://orcid.org/0000-0003-1887-1018 Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Nadathur, Seshadri O’Connor, Brendan Palanque-Delabrouille, Nathalie Palmese, Antonella Percival, Will J Pérez-Ràfols, Ignasi Poppett, Claire Prada, Francisco Rossi, Graziano Sanchez, Eusebio Schlegel, David https://orcid.org/0000-0002-5042-5088 Schubnell, Michael Shafieloo, Arman Silber, Joseph https://orcid.org/0000-0002-3461-0320 Sprayberry, David Tarlé, Gregory Weaver, Benjamin A Zou, Hu https://escholarship.org/uc/item/87w3z5gj The cross-correlation of cosmic voids with the lensing convergence ( κ ) map of the Cosmic Microwave Background (CMB) fluctuations provides a powerful tool to refine our understanding of the current cosmological model. However, several studies have reported a moderate tension (up to ∼2 σ ) between the lensing imprint of cosmic voids on the observed CMB and the ΛCDM signal predicted by simulations. To address this “lensing-is-low” tension and to obtain new, precise measurements of the signal, we exploit the large DESI Legacy Survey Luminous Red Galaxy (LRG) data set, covering approximately 19 500 deg 2 of the sky and including about 10 million LRGs at z &lt; 1.05. Our ΛCDM template was created using the Buzzard mocks, which we specifically calibrated to match the clustering properties of the observed galaxy sample by exploiting more than one million DESI spectra. We identified our catalogs of 3D voids in the range 0.35 &lt; z &lt; 0.95 and cross-correlated them through a stacking... https://escholarship.org/uc/item/87w3z5gj Mon, 31 Aug 2026 00:00:00 +0000 Sartori, S Vielzeuf, P Escoffier, S Cousinou, MC Kovács, A DeRose, J Ahlen, S Bianchi, D Brooks, D Burtin, E Claybaugh, T https://orcid.org/0000-0002-5024-6987 de la Macorra, A Forero-Romero, JE Garcia-Bellido, J Gontcho, S Gontcho A Gutierrez, G Honscheid, K Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Landriau, M Levi, ME https://orcid.org/0000-0003-1887-1018 Meisner, A Miquel, R Moustakas, J Newman, JA Palanque-Delabrouille, N Pérez-Ràfols, I Prada, F Rossi, G Sanchez, E Sprayberry, D Tarlé, G Weaver, BA https://escholarship.org/uc/item/7q14g34g This work presents timing measurements of 4H-SiC low gain avalanche detectors (4H-SiC LGADs) using beta particles from a ${}^{90}$ Sr source. The 4H-SiC LGADs exhibit fast signal responses, and a time resolution of 61 ps was achieved, comparable to that of standard Si LGADs. The present limitation in the time resolution of 4H-SiC LGADs appears to stem from limited charge generation. Nevertheless, their higher voltage tolerance and faster carrier drift suggest that, with increased charge collection, their timing performance could approach or even surpass that of Si LGADs. These results demonstrate the strong potential of 4H-SiC LGADs as a robust platform for precision timing in future 4-D tracking detectors, while also highlighting that signal charge is the dominant factor currently limiting their performance, indicating that further optimization of gain and drift structures will be essential for future development. https://escholarship.org/uc/item/7q14g34g Fri, 21 Aug 2026 00:00:00 +0000 Yang, Tao https://orcid.org/0000-0003-2161-5808 Satapathy, Yashas Sekely, Ben J Tishelman-Charny, Abraham Allion, Greg Atar, Gil Barletta, Philip Haber, Carl Holland, Steve Muth, John F Pavlidis, Spyridon Stucci, Stefania https://escholarship.org/uc/item/6d52d95v In the heterodyne approach to axion detection, axion dark matter induces transitions between two modes of a microwave cavity, resulting in a parametrically enhanced signal power. We describe the fabrication and characterization of a prototype normal conducting cavity specifically optimized for heterodyne detection. Corrugations on the cavity walls support linearly polarized hybrid modes which maximize the signal power while strongly suppressing noise. We demonstrate tuning mechanisms which allow one mode frequency to be scanned across a 4 MHz range, while suppressing cross-coupling noise by at least 80 dB. A future superconducting cavity with identical geometry to our prototype would have the potential to probe orders of magnitude beyond astrophysical bounds. https://escholarship.org/uc/item/6d52d95v Fri, 21 Aug 2026 00:00:00 +0000 Li, Zenghai Zhou, Kevin https://orcid.org/0000-0002-9810-3977 Oriunno, Marco Berlin, Asher Calatroni, Sergio D’Agnolo, Raffaele Tito Ellis, Sebastian AR Schuster, Philip Tantawi, Sami G Toro, Natalia https://escholarship.org/uc/item/7n99q295 Particle physics theories, such as those which explain neutrino flavor mixing, arise from a vast landscape of model-building possibilities. A model’s construction typically relies on the intuition of theorists. It also requires considerable effort to identify appropriate symmetry groups, assign field representations, and extract predictions for comparison with experimental data. We develop Autonomous Model Builder (AMBer), a framework in which a reinforcement learning agent interacts with a streamlined physics software pipeline to search these spaces efficiently. AMBer selects symmetry groups, particle content, and group representation assignments to construct models while minimizing the number of free parameters introduced. We validate our approach in well-studied regions of theory space and extend the exploration to a previously unexamined symmetry group. While demonstrated in the context of neutrino flavor theories, this approach of reinforcement learning with physics software... https://escholarship.org/uc/item/7n99q295 Thu, 20 Aug 2026 00:00:00 +0000 Baretz, Jason Benjamin Fieg, Max Ganesh, Vijay Ghosh, Aishik https://orcid.org/0000-0003-0819-1553 Knapp-Pérez, V Rudolph, Jake Whiteson, Daniel https://orcid.org/0000-0002-2005-3113 https://escholarship.org/uc/item/3pz3r1sh A measurement of the associated production of a top-quark pair with the Higgs boson (tt¯H$$ t\overline{t}H $$) in multilepton final states is presented. The analysis is based on a data sample of proton-proton collisions at s=13$$ \sqrt{s}=13 $$ TeV recorded with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 140 fb−1. Six final states defined by the number and flavour of reconstructed charged leptons are combined in a simultaneous likelihood fit to extract the tt¯H$$ t\overline{t}H $$ signal and constrain the most relevant backgrounds. The measured tt¯H$$ t\overline{t}H $$ cross-section normalised to Standard Model (SM) prediction is σtt¯H/σSM=0.63−0.19+0.20$$ {\sigma}_{t\overline{t}H}/{\sigma}^{\mathrm{SM}}=0.{63}_{-0.19}^{+0.20} $$. This result corresponds to an observed (expected) significance of 3.3σ (5.3σ). Additionally, two other fits are used to measure the tt¯H$$ t\overline{t}H $$ cross-section differentially in bins... https://escholarship.org/uc/item/3pz3r1sh Thu, 20 Aug 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Alexa, C Aleksandrov, IN Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Ambler, A Amelung, C Amerl, M Ames, CG Amezza, T Amini, B Amirie, K Amirkhanov, A Amor Dos Santos, SP Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Aperio Bella, L Apicella, M Appelt, C https://escholarship.org/uc/item/9474w7zh This paper presents two searches for the electroweak production of higgsinos with compressed mass spectra using 140 fb−1 of s=13$$ \sqrt{s}=13 $$ TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider. Events are required to feature an energetic jet, large missing transverse momentum, and at least one low-momentum charged particle that serves as a candidate higgsino decay product. In the first search, targeting higgsino mass splittings in the range of 0.3–1 GeV, the higgsinos are expected to predominantly decay into pions that are identified as low-momentum charged particles with large transverse impact parameters due to the long higgsino lifetime (cτ ≈ ?(0.1–10 mm)), and neural networks are used to discriminate between signal and background processes. The second search targets larger mass splittings in the range of 1–3 GeV, where the higgsinos are expected to decay promptly into low-momentum leptons, one of which is identified by dedicated... https://escholarship.org/uc/item/9474w7zh Wed, 19 Aug 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abulaiti, Y Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmadov, F Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JS Allen, JF Allport, PP Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Ames, CG Amezza, T Amidei, D Amini, B Amirie, K Amirkhanov, A Amor Dos Santos, SP Amos, KR Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M https://escholarship.org/uc/item/9318f4d5 This Letter analyzes the sensitivity of event geometry estimators to the initial-state kinematics of hard scattering in proton–lead collisions. This analysis uses dijets as a proxy for the parton–parton scattering configuration, correlating it with event geometry estimators, namely the energy deposited in the Zero-Degree Calorimeter and the transverse energy recorded in the Forward Calorimeter in the Pb-going direction. The analysis uses data recorded by the ATLAS detector at the Large Hadron Collider with a nucleon–nucleon center-of-mass energy of 8.16 TeV, corresponding to an integrated luminosity of 56 nb − 1 . The jets are measured within the pseudorapidity interval −2.8  &lt;  η  &lt;  4.5, where positive η values correspond to the direction of the proton beam. Results are presented as a function of the Bjorken-x of the parton originating from the proton, xp . Both event geometry estimators are found to be dependent on xp , with the energy deposited in the Zero-Degree Calorimeter... https://escholarship.org/uc/item/9318f4d5 Wed, 19 Aug 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Abulaiti, Y Acharya, BS Ackermann, A Bourdarios, C Adam Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmadov, F Ahuja, S Ai, X Aielli, G Aikot, A Tamlihat, M Ait Aitbenchikh, B Akbiyik, M Åkesson, TPA Akimov, AV Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Alkakhi, W Allaire, C Allbrooke, BMM Allen, JS Allen, JF Allport, PP Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Fernandez, A Alvarez Cardoso, M Alves Alviggi, MG Aly, M Coutinho, Y Amaral Ambler, A Amelung, C Amerl, M Ames, CG Amezza, T Amidei, D Amini, B Amirie, K Amirkhanov, A Dos Santos, SP Amor Amos, KR Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T https://escholarship.org/uc/item/7mh4f656 A search for a pair of low-mass pseudoscalars a that promptly decay into τ-leptons is presented using 140 fb −1 of proton–proton collision data at 13 TeV centre-of-mass energy recorded with the ATLAS detector at the Large Hadron Collider. The result is used to place constraints on exotic decays of the Higgs boson into four τ-leptons, H→aa→τ+τ−τ+τ−. This search focuses on events with either one or two τ-leptons decaying into hadrons and neutrinos, and the remaining three or two τ-leptons decaying into either electron or muon and neutrinos. No significant excess is observed above the expected Standard Model background and upper limits at the 95% confidence level on B(H→aa→τ+τ−τ+τ−) are set ranging from 0.06 to 0.23, depending on the mass ma ranging from 15 to 60 GeV. https://escholarship.org/uc/item/7mh4f656 Wed, 19 Aug 2026 00:00:00 +0000 Collaboration, The ATLAS https://escholarship.org/uc/item/5p3019t4 Skipper charge-coupled devices (CCDs) are ultralow-threshold detectors capable of detecting energy deposits in silicon at the electronvolt scale. Skipper CCDs are increasingly used in rare-event searches, including experiments such as SENSEI, DAMIC-M, Oscura, and CONNIE, where one of the major challenges is mitigating low-energy backgrounds. In this work, we present results on trap characterization in a silicon skipper-CCD produced in the same fabrication run as the SENSEI experiment at SNOLAB. Lattice defects contribute to backgrounds in rare-event searches through single-electron charge trapping. To investigate this, we use the charge-pumping technique at different temperatures to identify dipoles produced by traps in the CCD channel. We fully characterize a fraction of these traps and use this information to extrapolate their contribution to the single-electron background in SENSEI. We find that this subpopulation of traps does not contribute significantly, but more work is... https://escholarship.org/uc/item/5p3019t4 Wed, 19 Aug 2026 00:00:00 +0000 Brusco, Agustin Sivilotti, Bruno Botti, Ana M Cervantes, Brenda Desai, Ansh Essig, Rouven Estrada, Juan Etzion, Erez Moroni, Guillermo Fernandez Holland, Stephen E https://orcid.org/0000-0001-7218-3457 Lawson, Ian Luoma, Steffon Perez, Santiago E Rodrigues, Dario Tiffenberg, Javier Uemura, Sho Wu, Yikai https://escholarship.org/uc/item/39r313rc We use supersymmetric chiral dynamics perturbed by anomaly-mediated supersymmetry breaking to obtain a high-quality, composite axion that solves the strong problem. The strong dynamics arises from a supersymmetric SU(10) chiral gauge theory with massless matter chiral superfields. This leads to a stable, nonsupersymmetric vacuum, calculated exactly, where a spontaneously broken global symmetry, identified with the Peccei-Quinn (PQ) symmetry, gives rise to a composite QCD axion. The chiral gauge theory also admits a discrete (or ) gauge symmetry that forbids PQ-violating operators up to dimension eight. An extension to an chiral gauge theory incorporates grand unification where the unification scale is identified with the PQ-breaking scale and PQ-violating operators are forbidden up to dimension 20. The supersymmetry breaking scale, near 100&nbsp;TeV, ameliorates the Higgs hierarchy problem, while colored Nambu–Goldstone bosons may be detected at future colliders via decays... https://escholarship.org/uc/item/39r313rc Wed, 19 Aug 2026 00:00:00 +0000 Gherghetta, Tony Murayama, Hitoshi Noether, Bea Quílez, Pablo https://escholarship.org/uc/item/9b3494xv The Galactic Center Excess (GCE) may yet herald the discovery of annihilating dark matter. Weighing against that conclusion are analyses showing evidence for dim point sources within the spatial structure of the emission. Because of technical limitations these analyses are purely spatial with all spectral information that could disentangle the excess from astrophysical backgrounds discarded. Here, we demonstrate that a neural network simulation-based inference approach can jointly analyze the spatial and spectra data. The addition is profound: energy information drives the putative point sources to be significantly dimmer, indicating either the GCE is truly diffuse in nature or made of an exceptionally large number of sources. Quantitatively, for our best fit background model, the excess is essentially consistent with Poisson emission as predicted by dark matter. If due to point sources, our median prediction is O(10^{5}) sources, or more than 35 000 at 90%&nbsp;confidence-both... https://escholarship.org/uc/item/9b3494xv Tue, 18 Aug 2026 00:00:00 +0000 List, Florian Park, Yujin Rodd, Nicholas L https://orcid.org/0000-0003-3472-7606 Schoen, Eve https://orcid.org/0000-0001-8360-2098 Wolf, Florian https://escholarship.org/uc/item/6b5328td Context. Understanding how galaxies trace the underlying matter density field is essential for characterizing the influence of the large-scale structure on galaxy formation, being therefore a key ingredient in observational cosmology. This connection, commonly described through the galaxy bias, b , can be studied effectively using machine-learning (ML) techniques, which offer strong predictive capabilities and can capture nonlinear relationships in high-dimensional data. Recent work has also highlighted the need for probabilistic methods to properly account for the intrinsic stochasticity of this connection. Aims. We aim to incorporate the linear bias parameter assigned to individual galaxies into a ML framework, quantify its dependence on various halo and environmental properties, and evaluate whether different algorithms can accurately predict this parameter and reproduce the scatter in several bias relations. Methods. We use data from the IllustrisTNG300 magnetohydrodynamical... https://escholarship.org/uc/item/6b5328td Tue, 18 Aug 2026 00:00:00 +0000 Riveros-Jara, Catalina Montero-Dorta, Antonio D Rodrigues, Natália VN Amigo, Pía de Santi, Natalí SM Balaguera-Antolínez, Andrés Abramo, Raul Guzmán, Neill Artale, M Celeste https://escholarship.org/uc/item/63667427 A model-independent search for low-mass resonances decaying into pairs of oppositely charged muons is presented. The analysis uses proton-proton collision data corresponding to an integrated luminosity of 140 fb−1, recorded by the ATLAS detector at the Large Hadron Collider between 2015 and 2018. The search targets hypothetical dimuon resonances in the invariant mass range from 35 GeV to 75 GeV. The modelling of this mass region is particularly challenging for conventional analytic background parameterisations. To address this, a Gaussian process regression technique is used to model the background. The dimuon mass spectrum is analysed for potential signals, and no statistically significant excess is observed. Upper limits at the 95% confidence level are set on the fiducial production cross-section of new resonances decaying promptly into muons, ranging from 20 fb to 110 fb, depending on the resonance mass. These results are further interpreted in the context of dark-photon and... https://escholarship.org/uc/item/63667427 Tue, 18 Aug 2026 00:00:00 +0000 Aad, G Aakvaag, E Abbott, B Abdelhameed, S Abeling, K Abicht, NJ Abidi, SH Aboelela, M Aboulhorma, A Abramowicz, H Acharya, BS Ackermann, A Adam Bourdarios, C Adamczyk, L Addepalli, SV Addison, MJ Adelman, J Adiguzel, A Adye, T Affolder, AA https://orcid.org/0000-0002-9058-7217 Afik, Y Agaras, MN Aggarwal, A Agheorghiesei, C Ahmadov, F Ahuja, S Ahuja, S Ai, X Aielli, G Aikot, A Ait Tamlihat, M Aitbenchikh, B Åkesson, TPA Akiyama, D Akolkar, NN Aktas, S Alberghi, GL Albert, J Alberti, U Albicocco, P Albouy, GL Alderweireldt, S Alegria, ZL Aleksa, M Aleksandrov, IN Alexa, C Alexopoulos, T Alfonsi, F Algren, M Alhroob, M Ali, B Ali, HMJ Ali, S Alibocus, SW Aliev, M Alimonti, G Allaire, C Allbrooke, BMM Allen, DR Allen, JS Allen, JF Alley, CS Aloisio, A Alonso, F Alpigiani, C Alsolami, ZMK Alvarez Fernandez, A Alves Cardoso, M Alviggi, MG Aly, M Amaral Coutinho, Y Ambler, A Amelung, C Amerl, M Amezza, T Amini, B Amirie, K Amirkhanov, A Amor Dos Santos, SP Amperiadou, D An, S Anastopoulos, C Andeen, T Anders, JK Anderson, AC Andreazza, A Angelidakis, S Angerami, A Anisenkov, AV Annovi, A Antel, C Antipov, E Antonelli, M Anulli, F Aoki, M Aoki, T Aparo, MA Aperio Bella, L Apicella, M Appelt, C https://escholarship.org/uc/item/4r4159cj Semianalytic models are a widely used approach to simulate galaxy properties within a cosmological framework, relying on simplified yet physically motivated prescriptions. They have also proven to be an efficient alternative for generating accurate galaxy catalogs, offering a faster and less computationally expensive option compared to full hydrodynamical simulations. In this paper, we demonstrate that, using only galaxy 3D positions and radial velocities, we can train a graph neural network coupled to a moment neural network to obtain a robust machine-learning-based model capable of estimating the matter density parameters, Ωm, with a precision of approximately 10%. The network is trained on (25 h−1 Mpc)3 volumes of galaxy catalogs from L-Galaxies and can successfully extrapolate its predictions to other semianalytic models (GAEA, SC-SAM, and Shark) and, more remarkably, to hydrodynamical simulations (Astrid, SIMBA, IllustrisTNG, and SWIFT-EAGLE). Our results show that the network... https://escholarship.org/uc/item/4r4159cj Tue, 18 Aug 2026 00:00:00 +0000 de Santi, Natalí SM Villaescusa-Navarro, Francisco Araya-Araya, Pablo De Lucia, Gabriella Fontanot, Fabio Perez, Lucia A Arnés-Curto, Manuel Gonzalez-Perez, Violeta Chandro-Gómez, Ángel Somerville, Rachel S Castro, Tiago