A search is presented for charged Higgs bosons (H^±) in proton-proton (pp) collision events via the pp → (b)H^± processes, with H^± decaying into top (t) and bottom (b) quarks. The search targets final states with one lepton, missing transverse momentum, and two or more b jets. The analysis is based on data collected at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 138 fb^−1. We search for charged Higgs bosons in the 200 GeV to 1 TeV mass range. The results are interpreted within the generalized two-Higgs-doublet model (g2HDM). This model predicts additional Yukawa couplings of the Higgs bosons to the top quark ρtt, the top and charm quark ρtc, and the top and up quark ρtu. This search focuses on the real components of ρtt and ρtc, which are probed up to values of unity. An excess is observed with respect to the standard model expectation with a local significance of 2.4 standard deviations for a signal with an H^± boson mass ( mH^± ) of 600 GeV. Limits are derived on the product of the cross section σ(pp → (b)H^±) and branching fraction ℬ(H^±→ tb, t → bℓν), where ℓ = e, μ. The values of ρtc ≳ 0.11-0.38 are excluded at 95% confidence level, depending on the mH^± and ρtt assumptions. The results represent the first search for charged Higgs bosons within the g2HDM framework in the single-lepton final states and complement the existing results on additional neutral Higgs bosons perfomed in the same-sign top quark pair, three top quark, or four top quark final states, constraining extra Yukawa couplings for the neutral Higgs bosons below the TeV scale.[graphic not available: see fulltext]

Search for charged Higgs bosons decaying into top and bottom quarks in lepton+jets final states in proton-proton collisions at √s = 13 TeV

Abbrescia, M.;Barbieri, M.;Buonsante, M.;Colaleo, A.;De Palma, M.;Elmetenawee, W.;Generoso, L.;Louka, M.;Mastrapasqua, V.;My, S.;Nenna, F.;Nuzzo, S.;Pellecchia, A.;Pompili, A.;Radogna, R.;Stamerra, A.;Troiano, D.;Venditti, R.;Zaza, A.;D'Anzi, B.;
2026-01-01

Abstract

A search is presented for charged Higgs bosons (H^±) in proton-proton (pp) collision events via the pp → (b)H^± processes, with H^± decaying into top (t) and bottom (b) quarks. The search targets final states with one lepton, missing transverse momentum, and two or more b jets. The analysis is based on data collected at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 138 fb^−1. We search for charged Higgs bosons in the 200 GeV to 1 TeV mass range. The results are interpreted within the generalized two-Higgs-doublet model (g2HDM). This model predicts additional Yukawa couplings of the Higgs bosons to the top quark ρtt, the top and charm quark ρtc, and the top and up quark ρtu. This search focuses on the real components of ρtt and ρtc, which are probed up to values of unity. An excess is observed with respect to the standard model expectation with a local significance of 2.4 standard deviations for a signal with an H^± boson mass ( mH^± ) of 600 GeV. Limits are derived on the product of the cross section σ(pp → (b)H^±) and branching fraction ℬ(H^±→ tb, t → bℓν), where ℓ = e, μ. The values of ρtc ≳ 0.11-0.38 are excluded at 95% confidence level, depending on the mH^± and ρtt assumptions. The results represent the first search for charged Higgs bosons within the g2HDM framework in the single-lepton final states and complement the existing results on additional neutral Higgs bosons perfomed in the same-sign top quark pair, three top quark, or four top quark final states, constraining extra Yukawa couplings for the neutral Higgs bosons below the TeV scale.[graphic not available: see fulltext]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/601872
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