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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
  • Amoro´s, 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
  • 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-1of 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 mQare 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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