- Main
Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector
- Author(s): 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
- Afik, Y
- Agheorghiesei, C
- Aguilar-Saavedra, JA
- Ahmadov, F
- Aielli, G
- Akatsuka, S
- Åkesson, TPA
- Akilli, E
- Akimov, AV
- Alberghi, GL
- Albert, J
- Albicocco, P
- Alconada Verzini, MJ
- Alderweireldt, S
- Aleksa, M
- Aleksandrov, IN
- Alexa, C
- Alexopoulos, T
- Alhroob, M
- Ali, B
- Aliev, M
- 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
- Alvarez Gonzalez, B
- Álvarez Piqueras, D
- Alviggi, MG
- Amadio, BT
- Amaral Coutinho, Y
- Ambroz, L
- Amelung, C
- Amidei, D
- Amor Dos Santos, SP
- 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
- Aperio Bella, L
- Arabidze, G
- Araque, JP
- Araujo Ferraz, V
- Araujo Pereira, R
- Arce, ATH
- Ardell, RE
- Arduh, FA
- Arguin, JF
- Argyropoulos, S
- Armbruster, AJ
- Armitage, LJ
- Armstrong, A
- Arnaez, O
- et al.
Published Web Location
https://doi.org/10.1016/j.physletb.2018.07.035Abstract
The observation of Higgs boson production in association with a top quark pair (tt¯H), based on the analysis of proton–proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb , and considering Higgs boson decays into bb¯, WW , τ τ , γγ, and ZZ , the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the tt¯H searches using a dataset corresponding to integrated luminosities of 4.5 fb at 7 TeV and 20.3 fb at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total tt¯H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) (syst.) fb, in agreement with the Standard Model prediction. −1 ⁎ + − ⁎ −1 −1 +110 −100