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Search for pair production of vector-like top quarks in events with one lepton, jets, and missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector

  • Author(s): Aaboud, M;
  • Aad, G;
  • Abbott, B;
  • Abdinov, O;
  • Abeloos, B;
  • Abidi, SH;
  • AbouZeid, OS;
  • Abraham, NL;
  • Abramowicz, H;
  • Abreu, H;
  • Abreu, R;
  • Abulaiti, Y;
  • Acharya, BS;
  • Adachi, S;
  • Adamczyk, L;
  • Adelman, J;
  • Adersberger, M;
  • Adye, T;
  • Affolder, AA;
  • Agatonovic-Jovin, T;
  • Agheorghiesei, C;
  • Aguilar-Saavedra, JA;
  • Ahlen, SP;
  • Ahmadov, F;
  • Aielli, G;
  • Akatsuka, S;
  • Akerstedt, H;
  • Åkesson, TPA;
  • Akilli, E;
  • Akimov, AV;
  • Alberghi, GL;
  • Albert, J;
  • Albicocco, P;
  • Verzini, MJA;
  • Alderweireldt, SC;
  • Aleksa, M;
  • Aleksandrov, IN;
  • Alexa, C;
  • Alexander, G;
  • Alexopoulos, T;
  • Alhroob, M;
  • Ali, B;
  • Aliev, M;
  • Alimonti, G;
  • Alison, J;
  • Alkire, SP;
  • Allbrooke, BMM;
  • Allen, BW;
  • Allport, PP;
  • Aloisio, A;
  • Alonso, A;
  • Alonso, F;
  • Alpigiani, C;
  • Alshehri, AA;
  • Alstaty, M;
  • Gonzalez, BA;
  • Piqueras, DÁ;
  • Alviggi, MG;
  • Amadio, BT;
  • Coutinho, YA;
  • Amelung, C;
  • Amidei, D;
  • Santos, SPAD;
  • Amorim, A;
  • Amoroso, S;
  • Amundsen, G;
  • Anastopoulos, C;
  • Ancu, LS;
  • Andari, N;
  • Andeen, T;
  • Anders, CF;
  • Anders, JK;
  • Anderson, KJ;
  • Andreazza, A;
  • Andrei, V;
  • Angelidakis, S;
  • Angelozzi, I;
  • Angerami, A;
  • Anisenkov, AV;
  • Anjos, N;
  • Annovi, A;
  • Antel, C;
  • Antonelli, M;
  • Antonov, A;
  • Antrim, DJ;
  • Anulli, F;
  • Aoki, M;
  • Bella, LA;
  • Arabidze, G;
  • Arai, Y;
  • Araque, JP;
  • Ferraz, VA;
  • Arce, ATH;
  • Ardell, RE;
  • Arduh, FA;
  • Arguin, JF;
  • Argyropoulos, S;
  • Arik, M;
  • Armbruster, AJ
  • et al.
Abstract

The results of a search for vector-like top quarks using events with exactly one lepton, at least four jets, and large missing transverse momentum are reported. The search is optimised for pair production of vector-like top quarks in the Z() t + X decay channel. LHC pp collision data at a centre-of-mass energy of s=13 TeV recorded by the ATLAS detector in 2015 and 2016 are used, corresponding to an integrated luminosity of 36.1 fb−1. No significant excess over the Standard Model expectation is seen and upper limits on the production cross-section of a vector-like T quark pair as a function of the T quark mass are derived. The observed (expected) 95% CL lower limits on the T mass are 870 GeV (890 GeV) for the weak-isospin singlet model, 1.05 TeV (1.06 TeV) for the weak-isospin doublet model and 1.16 TeV (1.17 TeV) for the pure Zt decay mode. Limits are also set on the mass as a function of the decay branching ratios, excluding large parts of the parameter space for masses below 1 TeV.[Figure not available: see fulltext.].

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