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Search for heavy vector-like quarks coupling to light quarks in proton-proton collisions at √s=7 TeV with the ATLAS detector

  • Author(s): Aad, G;
  • Abbott, B;
  • Abdallah, J;
  • Abdel Khalek, S;
  • Abdelalim, AA;
  • Abdesselam, A;
  • Abdinov, O;
  • Abi, B;
  • Abolins, M;
  • AbouZeid, OS;
  • Abramowicz, H;
  • Abreu, H;
  • Acerbi, E;
  • Acharya, BS;
  • Adamczyk, L;
  • Adams, DL;
  • Addy, TN;
  • Adelman, J;
  • Aderholz, M;
  • Adomeit, S;
  • Adragna, P;
  • Adye, T;
  • Aefsky, S;
  • Aguilar-Saavedra, JA;
  • Aharrouche, M;
  • Ahlen, SP;
  • Ahles, F;
  • Ahmad, A;
  • Ahsan, M;
  • Aielli, G;
  • Akdogan, T;
  • A°kesson, TPA;
  • Akimoto, G;
  • Akimov, AV;
  • Akiyama, A;
  • Alam, MS;
  • Alam, MA;
  • Albert, J;
  • Albrand, S;
  • Aleksa, M;
  • Aleksandrov, IN;
  • Alessandria, F;
  • Alexa, C;
  • Alexander, G;
  • Alexandre, G;
  • Alexopoulos, T;
  • Alhroob, M;
  • Aliev, M;
  • Alimonti, G;
  • Alison, J;
  • Aliyev, M;
  • Allbrooke, BMM;
  • Allport, PP;
  • Allwood-Spiers, SE;
  • Almond, J;
  • Aloisio, A;
  • Alon, R;
  • Alonso, A;
  • Alvarez Gonzalez, B;
  • Alviggi, MG;
  • Amako, K;
  • Amaral, P;
  • Amelung, C;
  • Ammosov, VV;
  • Amorim, A;
  • Amorós, G;
  • Amram, N;
  • Anastopoulos, C;
  • Ancu, LS;
  • Andari, N;
  • Andeen, T;
  • Anders, CF;
  • Anders, G;
  • Anderson, KJ;
  • Andreazza, A;
  • Andrei, V;
  • Andrieux, ML;
  • Anduaga, XS;
  • Angerami, A;
  • Anghinolfi, F;
  • Anisenkov, A;
  • Anjos, N;
  • Annovi, A;
  • Antonaki, A;
  • Antonelli, M;
  • Antonov, A;
  • Antos, J;
  • Anulli, F;
  • Aoun, S;
  • Aperio Bella, L;
  • Apolle, R;
  • Arabidze, G;
  • Aracena, I;
  • Arai, Y;
  • Arce, ATH;
  • Archambault, JP;
  • Arfaoui, S;
  • Arguin, JF;
  • Arik, E;
  • Arik, M
  • et al.
Abstract

This Letter presents a search for singly produced vector-like quarks, Q, coupling to light quarks, q. The search is sensitive to both charged current (CC) and neutral current (NC) processes, pp?Qq?Wqq ' and pp?Qq?Zqq ' with a leptonic decay of the vector gauge boson. In 1.04fb -1 of data taken in 2011 by the ATLAS experiment at a center-of-mass energy vs=7 TeV, no evidence of such heavy vector-like quarks is observed above the expected Standard Model background. Limits on the heavy vector-like quark production cross section times branching ratio as a function of mass m Q are obtained. For a coupling ?qQ=v/mQ, where v is the Higgs vacuum expectation value, 95% C.L. lower limits on the mass of a vector-like quark are set at 900 GeV and 760 GeV from CC and NC processes, respectively. © 2012 CERN.

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