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Search for single production of vector-like quarks decaying to a top quark and a W boson in proton–proton collisions at √s = 13 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Asilar, Ece and Bergauer, Thomas and Md. Ali, Mohd. Adli (2019) Search for single production of vector-like quarks decaying to a top quark and a W boson in proton–proton collisions at √s = 13 TeV. European Physical Journal C, 79 (2). pp. 1-29. ISSN 1434-6044 E-ISSN 1434-6052

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Abstract

A search is presented for the single production of vector-like quarks in proton–proton collisions at √s = 13 TeV. The data, corresponding to an integrated luminosity of 35.9 fb−1, were recorded with the CMS experiment at the LHC. The analysis focuses on the vector-like quark decay into a top quark and a W boson, with one muon or electron in the final state. The mass of the vector-like quark candidate is reconstructed from hadronic jets, the lepton, and the missing transverse momentum. Methods for the identification of b quarks and of highly Lorentz boosted hadronically decaying top quarks and W bosons are exploited in this search. No significant deviation from the standard model background expectation is observed. Exclusion limits at 95% confidence level are set on the product of the production cross section and branching fraction as a function of the vector-like quark mass, which range from 0.3 to 0.03 pb for vector-like quark masses of 700 to 2000 GeV. Mass exclusion limits up to 1660 GeV are obtained, depending on the vector-like quark type, coupling, and decay width. These represent the most stringent exclusion limits for the single production of vectorlike quarks in this channel.

Item Type: Article (Journal)
Additional Information: 7861/71634
Uncontrolled Keywords: Vector-like quarks decaying; Top quark; W boson; Proton–proton collisions; √s = 13 TeV
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Science
Kulliyyah of Science > Department of Physics
Depositing User: Dr Mohd Adli MD Ali
Date Deposited: 16 Apr 2019 15:13
Last Modified: 31 Jul 2019 14:16
URI: http://irep.iium.edu.my/id/eprint/71634

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