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

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 $b\bar{b}$ 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.

52 pages in total, 11 figures, 4 tables, author list starts on page 35, submitted to JHEP. All figures can be found at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2019-04/

References in corpus (7)

• An Introduction to PYTHIA 8.2
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Pileup subtraction using jet areas
• The Catchment Area of Jets
• On the Interpretation of Top Partners Searches
• On the maximal use of Monte Carlo samples: re-weighting events at NLO accuracy
• Criteria for Natural Hierarchies

Cited by in corpus (9)

• Exploration at the high-energy frontier: ATLAS Run~2 searches investigating the exotic jungle beyond the Standard Model
• The ATLAS Trigger System for LHC Run 3 and Trigger performance in 2022
• Vector-like quarks: status and new directions at the LHC
• Anatomy of Vector-Like Bottom-Quark Models in the Alignment Limit of the 2-Higgs Doublet Model Type-II
• Global analysis and LHC study of a vector-like extension of the Standard Model with extra scalars
• Search for charged Higgs bosons through vector-like top quark pair production at the LHC
• Interplay of Traditional Methods and Machine Learning Algorithms for Tagging Boosted Objects
• Exploring vector-like $B$-quark pair production at CLIC in fully hadronic final states
• Rescuing 331 bileptons from the Landau pole