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

The CMS collaboration

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A search for single production of vector-like quarks, T and B, decaying into a Z boson and a top or a bottom quark, respectively, is presented. The search is performed using data collected by the CMS experiment at the LHC in proton-proton collisions at s=13 TeV, corresponding to an integrated luminosity of 2.3fb−1. An exotic T quark production mode through the decay of a heavy Z′ resonance is also considered. The search is performed in events with a Z boson decaying leptonically, accompanied by a bottom or a top quark decaying hadronically. No excess of events is observed over the standard model background expectation. Products of production cross section and branching fraction for T and B quarks from 1.26 and 0.13 pb are excluded at 95% confidence level for the range of resonance mass considered, which is between 0.7 and 1.7 TeV. Limits on the product of the Z′ boson production cross section and branching fraction, with the Z′ boson decaying to the Tt final state, are set between 0.31 and 0.13 pb, for Z′ boson masses in the range from 1.5 to 2.5 TeV. This is the first search at 13 TeV for single production of vector-like quarks in events with a Z boson decaying leptonically accompanied by boosted jets.[Figure not available: see fulltext.].

Original languageEnglish
Article number29
JournalJournal of High Energy Physics
Volume2017
Issue number5
DOIs
Publication statusPublished - 1 May 2017

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bosons
quarks
collisions
protons
cross sections
products
confidence
luminosity
decay

Keywords

  • Beyond Standard Model
  • Hadron-Hadron scattering (experiments)
  • vectorlike quarks

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Search for single production of vector-like quarks decaying to a Z boson and a top or a bottom quark in proton-proton collisions at √s=13 TeV. / The CMS collaboration.

In: Journal of High Energy Physics, Vol. 2017, No. 5, 29, 01.05.2017.

Research output: Contribution to journalArticle

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abstract = "A search for single production of vector-like quarks, T and B, decaying into a Z boson and a top or a bottom quark, respectively, is presented. The search is performed using data collected by the CMS experiment at the LHC in proton-proton collisions at s=13 TeV, corresponding to an integrated luminosity of 2.3fb−1. An exotic T quark production mode through the decay of a heavy Z′ resonance is also considered. The search is performed in events with a Z boson decaying leptonically, accompanied by a bottom or a top quark decaying hadronically. No excess of events is observed over the standard model background expectation. Products of production cross section and branching fraction for T and B quarks from 1.26 and 0.13 pb are excluded at 95{\%} confidence level for the range of resonance mass considered, which is between 0.7 and 1.7 TeV. Limits on the product of the Z′ boson production cross section and branching fraction, with the Z′ boson decaying to the Tt final state, are set between 0.31 and 0.13 pb, for Z′ boson masses in the range from 1.5 to 2.5 TeV. This is the first search at 13 TeV for single production of vector-like quarks in events with a Z boson decaying leptonically accompanied by boosted jets.[Figure not available: see fulltext.].",
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