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

CMS Collaboration

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number90
JournalEuropean Physical Journal C
Volume79
Issue number2
DOIs
Publication statusPublished - 1 Feb 2019

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Bosons
bosons
quarks
collisions
exclusion
Luminance
Momentum
decay
transverse momentum
leptons
muons
confidence
Electrons
luminosity
deviation

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

Cite this

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

In: European Physical Journal C, Vol. 79, No. 2, 90, 01.02.2019.

Research output: Contribution to journalArticle

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abstract = "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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