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
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Sirunyan2019_Article_SearchForSingleProductionOfVec.pdf
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Author(s)
CMS Collaboration
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Azzolini, Virginia
Baty, Austin Alan
Bauer, Gerry P
Bi, Ran
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Date Issued
December 2018
Journal
European Physical Journal C: Particles and Fields
Publisher
Springer-Verlag
Citation
Sirunyan, A. M. et al. “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.” The European Physical Journal C 79, 2 (January 2019): 90 © CERN for the benefit of the CMS collaboration
Version
Final published version
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 35.9fb⁻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 0.03pb for vector-like quark masses of 700 to 2000GeV. Mass exclusion limits up to 1660GeV 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 vector-like quarks in this channel.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-019-6556-3
