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Scientific article
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English

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

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 12, no. 12
Publication date2023
First online date2023-12-12
Abstract

A search for new heavy scalars with flavour-violating decays in final 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 (ρ$_{tt}$, ρ$_{tc}$, and ρ$_{tu}$). The targeted signals lead to final 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 $ \sqrt{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 m$_{H}$ between 200 − 630 GeV with couplings ρ$_{tt}$ = 0.4, ρ$_{tc}$ = 0.2, and ρ$_{tu}$ = 0.2 are excluded at 95% confidence level. Additional interpretations are provided in models of R-parity violating supersymmetry, motivated by the recent flavour and (g − 2)$_{μ}$ anomalies.

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Keywords
  • Beyond Standard Model
  • Exotics
  • Hadron-Hadron Scattering
  • P p: scattering
  • P p: colliding beams
  • Higgs particle: heavy
  • Higgs particle: doublet
  • Higgs particle: rare decay
  • Boson: scalar
  • Lepton: charge
  • Jet: bottom
  • Bottom: particle identification
  • ATLAS
  • Electron
  • Lepton: multiplicity
  • Muon: magnetic moment
  • CERN LHC Coll
  • Same sign
  • Supersymmetry: parameter space
  • R parity: violation
  • Lepton number: violation
  • Flavor: violation
  • Magnetic moment: anomaly
  • Neural network
  • Channel cross section: upper limit
  • Data analysis method
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for heavy Higgs bosons with flavour-violating couplings in multi-lepton plus b-jets final states in pp collisions at 13 TeV with the ATLAS detector. In: The journal of high energy physics, 2023, vol. 12, n° 12. doi: 10.1007/jhep12(2023)081
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ISSN of the journal1029-8479
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