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.

Zwalinski, L., Zou, W., Zormpa, O., Zorbas, T.G., Zoch, K., Zoccoli, A., et al. (2025). Search for a light charged Higgs boson in t → H±b decays, with H± → cs, in pp collisions at √s=13 TeV with the ATLAS detector. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 85(2) [10.1140/epjc/s10052-024-13715-4].

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

Cerri A.;
2025-01-01

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.
2025
Zwalinski, L., Zou, W., Zormpa, O., Zorbas, T.G., Zoch, K., Zoccoli, A., et al. (2025). Search for a light charged Higgs boson in t → H±b decays, with H± → cs, in pp collisions at √s=13 TeV with the ATLAS detector. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 85(2) [10.1140/epjc/s10052-024-13715-4].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1317650