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Search for a light charged Higgs boson in t→H±b decays, with H±→cs, in pp collisions at s=13TeV with the ATLAS detector

Aad, G. ; Åkesson, T.P.A. LU orcid ; Astrand, K.S.V. LU ; Doglioni, C. LU ; Ekman, P.A. LU orcid ; Hedberg, V. LU ; Herde, H. LU orcid ; Konya, B. LU ; Lytken, E. LU orcid and Poettgen, R. LU orcid , et al. (2025) In European Physical Journal C 85(2).
Abstract
A search for a light charged Higgs boson produced in decays of the top quark, t→H±b with H±→cs, is presented. This search targets the production of top-quark pairs tt¯→WbH±b, with W→ℓν (ℓ=e,μ), resulting in a lepton-plus-jets final state characterised by an isolated electron or muon and at least four jets. The search exploits b-quark and c-quark identification techniques as well as multivariate methods to suppress the dominant tt¯ background. The data analysed correspond to 140fb-1 of pp collisions at s=13TeV recorded with the ATLAS detector at the LHC between 2015 and 2018. Observed (expected) 95% confidence-level upper limits on the branching fraction B(t→H±b), assuming B(t→Wb)+B(t→H±(→cs)b)=1.0, are set between 0.066% (0.077%) and 3.6%... (More)
A search for a light charged Higgs boson produced in decays of the top quark, t→H±b with H±→cs, is presented. This search targets the production of top-quark pairs tt¯→WbH±b, with W→ℓν (ℓ=e,μ), resulting in a lepton-plus-jets final state characterised by an isolated electron or muon and at least four jets. The search exploits b-quark and c-quark identification techniques as well as multivariate methods to suppress the dominant tt¯ background. The data analysed correspond to 140fb-1 of pp collisions at s=13TeV recorded with the ATLAS detector at the LHC between 2015 and 2018. Observed (expected) 95% confidence-level upper limits on the branching fraction B(t→H±b), assuming B(t→Wb)+B(t→H±(→cs)b)=1.0, are set between 0.066% (0.077%) and 3.6% (2.3%) for a charged Higgs boson with a mass between 60 and 168 GeV. © The Author(s) 2025. (Less)
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type
Contribution to journal
publication status
published
subject
keywords
Charged particles, Colliding beam accelerators, Jets, ATLAS detectors, B-decays, Branching fractions, Confidence levels, Final state, Higgs boson, Identification techniques, Multivariate methods, Top quarks, Upper limits, Bosons
in
European Physical Journal C
volume
85
issue
2
article number
153
publisher
Springer Nature
external identifiers
  • scopus:105001209933
ISSN
1434-6044
DOI
10.1140/epjc/s10052-024-13715-4
language
English
LU publication?
yes
id
bfd97b33-a52e-40f2-9ebd-53c58646613d
date added to LUP
2026-03-05 11:07:23
date last changed
2026-03-05 11:07:54
@article{bfd97b33-a52e-40f2-9ebd-53c58646613d,
  abstract     = {{A search for a light charged Higgs boson produced in decays of the top quark, t→H±b with H±→cs, is presented. This search targets the production of top-quark pairs tt¯→WbH±b, with W→ℓν (ℓ=e,μ), resulting in a lepton-plus-jets final state characterised by an isolated electron or muon and at least four jets. The search exploits b-quark and c-quark identification techniques as well as multivariate methods to suppress the dominant tt¯ background. The data analysed correspond to 140fb-1 of pp collisions at s=13TeV recorded with the ATLAS detector at the LHC between 2015 and 2018. Observed (expected) 95% confidence-level upper limits on the branching fraction B(t→H±b), assuming B(t→Wb)+B(t→H±(→cs)b)=1.0, are set between 0.066% (0.077%) and 3.6% (2.3%) for a charged Higgs boson with a mass between 60 and 168 GeV. © The Author(s) 2025.}},
  author       = {{Aad, G. and Åkesson, T.P.A. and Astrand, K.S.V. and Doglioni, C. and Ekman, P.A. and Hedberg, V. and Herde, H. and Konya, B. and Lytken, E. and Poettgen, R. and Smirnova, O. and Wallin, E.J. and Zwalinski, L.}},
  issn         = {{1434-6044}},
  keywords     = {{Charged particles; Colliding beam accelerators; Jets; ATLAS detectors; B-decays; Branching fractions; Confidence levels; Final state; Higgs boson; Identification techniques; Multivariate methods; Top quarks; Upper limits; Bosons}},
  language     = {{eng}},
  number       = {{2}},
  publisher    = {{Springer Nature}},
  series       = {{European Physical Journal C}},
  title        = {{Search for a light charged Higgs boson in t→H±b decays, with H±→cs, in pp collisions at s=13TeV with the ATLAS detector}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-024-13715-4}},
  doi          = {{10.1140/epjc/s10052-024-13715-4}},
  volume       = {{85}},
  year         = {{2025}},
}