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

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Issue Date
2019-01-30Author
Sirunyan, A. M.
Sanders, Stephen J.
CMS Collaboration
Publisher
SpringerOpen
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
© CERN for the benefit of the CMS collaboration 2019.
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A search is presented for the single production of vector-like quarks in proton–proton collisions at 𝑠√=13TeV. 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.
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This work is licensed under a Creative Commons Attribution 4.0 International License.
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Citation
Sirunyan, A.M., Tumasyan, A., Adam, W. 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√=13TeV. Eur. Phys. J. C 79, 90 (2019). https://doi.org/10.1140/epjc/s10052-019-6556-3
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