Search for charged Higgs bosons produced in top-quark decays or in association with top quarks and decaying via H^± → τ^±ν_τ in 13 TeV pp collisions with the ATLAS detector

2024/12/23 by ATLAS Collaboration
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2412.17584

Abstract

Charged Higgs bosons produced either in top-quark decays or in association with a top-quark, subsequently decaying via H^± → τ^±ν_τ, are searched for in 140 fb^-1 of proton-proton collision data at √(s)=13 TeV recorded with the ATLAS detector. Depending on whether the top-quark produced together with the H^± decays hadronically or semi-leptonically, the search targets τ+jets or τ+lepton final states, in both cases with a τ-lepton decaying into a neutrino and hadrons. No significant excess over the Standard Model background expectation is observed. For the mass range of 80 ≤ m_H^± ≤ 3000 GeV, upper limits at 95% confidence level are set on the production cross-section of the charged Higgs boson times the branching fraction \mathrm\calB(H^± → τ^±ν_τ) in the range 4.5 pb-0.4 fb. In the mass range 80-160 GeV, assuming the Standard Model cross-section for tt production, this corresponds to upper limits between 0.27% and 0.02% on \mathrm\calB(t→ bH^±) × \mathrm\calB(H^± → τ^±ν_τ).

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