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Search for heavy Higgs bosons with favour-violating couplings in multi-lepton plus b-jets fnal states in pp collisions at 13 TeV with the ATLAS detector ATLAS Collaboration

Abstract

A search for new heavy scalars with favour-violating decays in fnal states with multiple leptons and b-tagged jets is presented. The results are interpreted in terms of a general two-Higgs-doublet model involving an additional scalar with couplings to the top-quark and the three up-type quarks (ρtt, ρtc, and ρtu). The targeted signals lead to fnal states with either a same-sign top-quark pair, three top-quarks, or four top-quarks. The search is based on a data sample of proton-proton collisions at √ s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb−1 . Events are categorised depending on the multiplicity of light charged leptons (electrons or muons), total lepton charge, and a deep-neural-network output to enhance the purity of each of the signals. Masses of an additional scalar boson mH between 200 − 630 GeV with couplings ρtt = 0.4, ρtc = 0.2, and ρtu = 0.2 are excluded at 95% confdence level. Additional interpretations are provided in models of R-parity violating supersymmetry, motivated by the recent favour and (g − 2)µ anomalies.

Item Metadata

Title
Search for heavy Higgs bosons with favour-violating couplings in multi-lepton plus b-jets fnal states in pp collisions at 13 TeV with the ATLAS detector
Creator
ATLAS Collaboration
Publisher
Springer Berlin Heidelberg
Date Issued
2023-12-12
Description
A search for new heavy scalars with favour-violating decays in fnal states with multiple leptons and b-tagged jets is presented. The results are interpreted in terms of a general two-Higgs-doublet model involving an additional scalar with couplings to the top-quark and the three up-type quarks (ρtt, ρtc, and ρtu). The targeted signals lead to fnal states with either a same-sign top-quark pair, three top-quarks, or four top-quarks. The search is based on a data sample of proton-proton collisions at √ s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb−1 . Events are categorised depending on the multiplicity of light charged leptons (electrons or muons), total lepton charge, and a deep-neural-network output to enhance the purity of each of the signals. Masses of an additional scalar boson mH between 200 − 630 GeV with couplings ρtt = 0.4, ρtc = 0.2, and ρtu = 0.2 are excluded at 95% confdence level. Additional interpretations are provided in models of R-parity violating supersymmetry, motivated by the recent favour and (g − 2)µ anomalies.
Subject
Beyond Standard Model; Exotics; Hadron-Hadron Scattering
Genre
Article
Type
Text
Language
eng
Date Available
2024-10-24
Provider
Vancouver : University of British Columbia Library
Rights
Attribution 4.0 International (CC BY 4.0)
DOI
10.14288/1.0447093
URI
http://hdl.handle.net/2429/89533
Affiliation
Science, Faculty of; TRIUMF; Non UBC; Physics and Astronomy, Department of
Citation
Journal of High Energy Physics. 2023 Dec 12;2023(12):81
Publisher DOI
10.1007/JHEP12(2023)081
Peer Review Status
Reviewed
Scholarly Level
Faculty
Copyright Holder
The Author(s)
Rights URI
http://creativecommons.org/licenses/by/4.0/
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Attribution 4.0 International (CC BY 4.0)