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Search for heavy vector-like quarks coupling to light quarks in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
LAPP, CNRS/IN2P3 and Université de Savoie, Annecy-le-Vieux, France.
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2012 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 712, no 1-2, 22-39 p.Article in journal (Refereed) Published
Abstract [en]

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, p p --> Q q --> W q q' and p p --> Q q --> Z q q' with a leptonic decay of the vector gauge boson. In 1.04/fb of data taken in 2011 by the ATLAS experiment at a center-of-mass energy sqrt(s) = 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 kappa_(qQ) = v/m_Q, 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.

Place, publisher, year, edition, pages
2012. Vol. 712, no 1-2, 22-39 p.
Keyword [en]
electroweak symmetry-breaking
National Category
Subatomic Physics
URN: urn:nbn:se:kth:diva-84577DOI: 10.1016/j.physletb.2012.03.082ISI: 000304742500005ScopusID: 2-s2.0-84860836272OAI: diva2:499374
Swedish Research Council

QC 20120704. Updated from submitted to published.

Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2012-07-04Bibliographically approved

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Jovicevic, JelenaKuwertz, EmmaLafaye, RemiLund-Jensen, BengtStrandberg, Jonas
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