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



Aad, G, Abbott, B, Abbott, DC, Abed Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H
et al (show 2891 more authors) (2023) Search for a light charged Higgs boson in t → H±b decays, with H± → cb, in the lepton+jets final state in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector. Journal of High Energy Physics, 2023 (9). 4-.

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A search for a charged Higgs boson, <jats:italic>H</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup>, produced in top-quark decays, <jats:italic>t</jats:italic> → <jats:italic>H</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup><jats:italic>b</jats:italic>, is presented. The search targets <jats:italic>H</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup> decays into a bottom and a charm quark, <jats:italic>H</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup> → <jats:italic>cb</jats:italic>. The analysis focuses on a selection enriched in top-quark pair production, where one top quark decays into a leptonically decaying <jats:italic>W</jats:italic> 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 <jats:italic>b</jats:italic>-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 <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 13 TeV between 2015 and 2018 with the ATLAS detector at CERN’s Large Hadron Collider, amounting to an integrated luminosity of 139 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>. 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 <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \mathcal{B} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>B</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>(<jats:italic>t</jats:italic> → <jats:italic>H</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup><jats:italic>b</jats:italic>) × <jats:italic>B</jats:italic>(<jats:italic>H</jats:italic><jats:sup><jats:italic>±</jats:italic></jats:sup> → <jats:italic>cb</jats:italic>) for charged Higgs boson masses between 60 and 160 GeV, assuming the SM production of the top-quark pairs.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 16 Feb 2024 09:15
Last Modified: 18 Mar 2024 03:35
DOI: 10.1007/jhep09(2023)004
Open Access URL: https://link.springer.com/article/10.1007/JHEP09(2...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3178701