Search for single production of vector-like quarks decaying into <i>Wb</i> in p<i>p</i> collisions at √<i>s</i>=13 TeV with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2910 more authors) (2019) Search for single production of vector-like quarks decaying into <i>Wb</i> in p<i>p</i> collisions at √<i>s</i>=13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 76 (5). 164-.

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Abstract

A search for singly produced vector-like quarks $Q$, where $Q$ can be either a $T$ quark with charge $+2/3$ or a $Y$ quark with charge $-4/3$, is performed in proton-proton collision data at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of $36.1 \text{fb}^{-1}$, recorded with the ATLAS detector at the LHC in 2015 and 2016. The analysis targets $Q \to Wb$ decays where the $W$ boson decays leptonically. No significant deviation from the expected Standard Model background is observed. Upper limits are set on the $QWb$ coupling strength and the mixing between the Standard Model sector and a singlet $T$ quark or a $Y$ quark from a $(B,Y)$ doublet or a $(T,B,Y)$ triplet, taking into account the interference effects with the Standard Model background. The upper limits set on the mixing angle are as small as $|\sin{\theta_{\text{L}}}|= 0.18$ for a singlet $T$ quark of mass 800 GeV, $|\sin{\theta_{\text{R}}}|= 0.17$ for a $Y$ quark of mass 800 GeV in a $(B,Y)$ doublet model and $|\sin{\theta_{\text{L}}}|= 0.16$ for a $Y$ quark of mass 800 GeV in a $(T,B,Y)$ triplet model. Within a $(B,Y)$ doublet model, the limits set on the mixing parameter $|\sin{\theta_{\text{R}}}|$ are comparable with the exclusion limits from electroweak precision observables in the mass range between about 900 GeV and 1250 GeV.

Item Type: Article
Additional Information: 56 pages in total, author list starting page 40, 9 figures, 7 tables, submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2016-17
Uncontrolled Keywords: Exotics, Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 07 Nov 2016 08:29
Last Modified: 14 Oct 2023 16:27
DOI: 10.1007/JHEP05(2019)164
Open Access URL: http://link.springer.com/article/10.1140/epjc/s100...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3004356