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English

Search for single vector-like B quark production and decay via B → bH($ b\overline{b} $) in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 11, no. 11
Publication date2023
First online date2023-11-23
Abstract

A search is presented for single production of a vector-like B quark decaying into a Standard Model b-quark and a Standard Model Higgs boson, which decays into a $ b\overline{b} $ pair. The search is carried out in 139 fb$^{−1}$ of $ \sqrt{s} $ = 13 TeV proton-proton collision data collected by the ATLAS detector at the LHC between 2015 and 2018. No significant deviation from the Standard Model background prediction is observed, and mass-dependent exclusion limits at the 95% confidence level are set on the resonance production cross-section in several theoretical scenarios determined by the couplings c$_{W}$, c$_{Z}$ and c$_{H}$ between the B quark and the Standard Model W, Z and Higgs bosons, respectively. For a vector-like B occurring as an isospin singlet, the search excludes values of c$_{W}$ greater than 0.45 for a B resonance mass (m$_{B}$) between 1.0 and 1.2 TeV. For 1.2 TeV < m$_{B}$< 2.0 TeV, c$_{W}$ values larger than 0.50–0.65 are excluded. If the B occurs as part of a (B, Y) doublet, the smallest excluded c$_{Z}$ coupling values range between 0.3 and 0.5 across the investigated resonance mass range 1.0 TeV < m$_{B}$< 2.0 TeV.

eng
Keywords
  • Vector-Like Quarks
  • Beyond Standard Model
  • Exotics
  • Hadron-Hadron Scattering
  • P p: colliding beams
  • Quark: postulated particle
  • Quark: vector particle
  • Resonance: mass
  • P p: scattering
  • Resonance: production
  • Quark: single production
  • Quark: decay modes
  • Isospin: singlet
  • ATLAS
  • Higgs particle: hadronic decay
  • Bottom: pair production
  • Final state: ((n)jet)
  • Jet: bottom
  • Mass dependence
  • CERN LHC Coll
  • Background
  • Quark: doublet
  • Quark: mass: lower limit
  • Coupling constant: upper limit
  • Channel cross section: upper limit
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for single vector-like B quark production and decay via B → bH($ b\overline{b} $) in pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 11, n° 11. doi: 10.1007/jhep11(2023)168
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ISSN of the journal1029-8479
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