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

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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 ATLAS Collaboration

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 → ν ( = 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 140 fb−1 of pp collisions at √s = 13 TeV 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 → W b) + 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.

Item Metadata

Title	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
Creator	ATLAS Collaboration
Publisher	Springer Berlin Heidelberg
Date Issued	2025-02-06
Description	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 → ν ( = 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 140 fb−1 of pp collisions at √s = 13 TeV 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 → W b) + 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.
Genre	Article
Type	Text
Language	eng
Date Available	2025-02-07
Provider	Vancouver : University of British Columbia Library
Rights	Attribution 4.0 International (CC BY 4.0)
DOI	10.14288/1.0448042
URI	http://hdl.handle.net/2429/90348
Affiliation	Science, Faculty of; TRIUMF; Non UBC; Physics and Astronomy, Department of
Citation	The European Physical Journal C. 2025 Feb 06;85(2):153
Publisher DOI	10.1140/epjc/s10052-024-13715-4
Peer Review Status	Reviewed
Scholarly Level	Faculty; Researcher
Copyright Holder	The Author(s)
Rights URI	http://creativecommons.org/licenses/by/4.0/
Aggregated Source Repository	DSpace

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