Search for single production of vector-like quarks decaying into Wb in pp collisions at [Formula: see text] TeV with the ATLAS detector

. 2016 ; 76 (8) : 442. [epub] 20160808

Status PubMed-not-MEDLINE Jazyk angličtina Země Francie Médium print-electronic

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/pmid28303082

A search for singly produced vector-like Q quarks, where Q can be either a T quark with charge [Formula: see text] or a Y quark with charge [Formula: see text], is performed in proton-proton collisions recorded with the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 20.3 fb[Formula: see text] and was produced with a centre-of-mass energy of [Formula: see text] TeV. This analysis targets [Formula: see text] decays where the W boson decays leptonically. A veto on massive large-radius jets is used to reject the dominant [Formula: see text] background. The reconstructed Q-candidate mass, ranging from 0.4 to 1.2 TeV, is used in the search to discriminate signal from background processes. No significant deviation from the Standard Model expectation is observed, and limits are set on the [Formula: see text] cross-section times branching ratio. The results are also interpreted as limits on the QWb coupling and the mixing with the Standard Model sector for a singlet T quark or a Y quark from a doublet. T quarks with masses below 0.95 TeV are excluded at 95 % confidence level, assuming a unit coupling and a BR[Formula: see text], whereas the expected limit is 1.10 TeV.

2 Physikalisches Institut Georg August Universität Göttingen Germany

2 Physikalisches Institut Justus Liebig Universität Giessen Giessen Germany

Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland

B 1 Stepanov Institute of Physics National Academy of Sciences of Belarus Minsk Republic of Belarus

Budker Institute of Nuclear Physics SB RAS Novosibirsk Russia

Cavendish Laboratory University of Cambridge Cambridge UK

Center for High Energy Physics University of Oregon Eugene OR USA

Centre de Calcul de l'Institut National de Physique Nucléaire et de Physique des Particules Villeurbanne France

Centre National de l'Energie des Sciences Techniques Nucleaires Rabat Morocco

Centro de Física Nuclear da Universidade de Lisboa Lisbon Portugal

Centro de Investigaciones Universidad Antonio Narino Bogotá Colombia

CERN Geneva Switzerland

CPPM Aix Marseille Université and CNRS IN2P3 Marseille France

Czech Technical University Prague Prague Czech Republic

D 5 Skobeltsyn Institute of Nuclear Physics M 5 Lomonosov Moscow State University Moscow Russia

Departamento de Física Pontificia Universidad Católica de Chile Santiago Chile

Departamento de Fisica Teorica C 15 Universidad Autonoma de Madrid Madrid Spain

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E Andronikashvili Institute of Physics Iv Javakhishvili Tbilisi State University Tbilisi Georgia

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