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Scientific article
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Search for a light charged Higgs boson in $t \rightarrow H^{\pm}b$ decays, with $H^{\pm} \rightarrow cb$, in the lepton+jets final state in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 09, no. 9
Publication date2023
First online date2023-09-01
Abstract

A search for a charged Higgs boson, H$^{±}$, produced in top-quark decays, t → H$^{±}$b, is presented. The search targets H$^{±}$ decays into a bottom and a charm quark, H$^{±}$ → cb. The analysis focuses on a selection enriched in top-quark pair production, where one top quark decays into a leptonically decaying W boson and a bottom quark, and the other top quark decays into a charged Higgs boson and a bottom quark. This topology leads to a lepton-plus-jets final state, characterised by an isolated electron or muon and at least four jets. The search exploits the high multiplicity of jets containing b-hadrons, and deploys a neural network classifier that uses the kinematic differences between the signal and the background. The search uses a dataset of proton-proton collisions collected at a centre-of-mass energy $ \sqrt{s} $ = 13 TeV between 2015 and 2018 with the ATLAS detector at CERN’s Large Hadron Collider, amounting to an integrated luminosity of 139 fb$^{−1}$. Observed (expected) 95% confidence-level upper limits between 0.15% (0.09%) and 0.42% (0.25%) are derived for the product of branching fractions $ \mathcal{B} $(t → H$^{±}$b) × B(H$^{±}$ → cb) for charged Higgs boson masses between 60 and 160 GeV, assuming the SM production of the top-quark pairs.[graphic not available: see fulltext]

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Keywords
  • Hadron-Hadron Scattering
  • P p: scattering
  • P p: colliding beams
  • Higgs particle: charged particle
  • Top: rare decay
  • Top: pair production
  • Higgs particle: hadronic decay
  • Jet: multiplicity: high
  • Higgs particle: mass
  • Final state: ((n)jet lepton)
  • ATLAS
  • Muon
  • CERN Lab
  • Electron
  • CERN LHC Coll
  • Kinematics
  • Background
  • Charm: particle identification
  • Bottom: particle identification
  • Neural network
  • Topology
  • Top: branching ratio
  • Higgs particle: branching ratio
  • Branching ratio: upper limit
  • Statistical analysis
  • Data analysis method
  • Experimental results
  • Top --> Higgs particle bottom
  • Higgs particle --> charm bottom
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for a light charged Higgs boson in $t \rightarrow H^{\pm}b$ decays, with $H^{\pm} \rightarrow cb$, in the lepton+jets final state in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 09, n° 9. doi: 10.1007/jhep09(2023)004
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ISSN of the journal1029-8479
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