Search for a light charged Higgs boson in $t \to H^\pm b$ decays, with $H^\pm \to cs$, in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

The ATLAS collaboration
CERN-EP-2024-185, 2024.

Abstract (data abstract)
A search for a light charged Higgs boson produced in decays of the top quark, $t \to H^\pm b$ with $H^\pm \to cs$, is presented.This search targets the production of top-quark pairs $t\bar{t} \to Wb H^\pm b$, with $W \to \ell\nu$ ($\ell = e, \mu$),resulting in a lepton-plus-jets final state characterised by an isolated electron or muon and at least four jets.The search exploits $b$-quark and $c$-quark identification techniques as well as multivariate methods to suppress the dominant $t\bar{t}$ background.The data analysed correspond to $140\,\text{fb}^{-1}$ of $pp$ collisions at $\sqrt{s} = 13\,\text{TeV}$ recorded with the ATLAS detector at the LHC between 2015 and 2018.Observed (expected) $95\,$% confidence-level upper limits on the branching fraction $\mathscr{B}(t\to H^\pm b)$, assuming $\mathscr{B}(t\to Wb) + \mathscr{B}(t \to H^\pm (\to cs)b)=1.0$,are set between $0.066\,$% ($0.077\,$%) and $3.6\,$% ($2.3\,$%) for a charged Higgs boson with a mass between 60 and $168\,$GeV.

  • Dijet mass

    Tabulated data from Figure 4(b) in the publication

    10.17182/hepdata.154176.v1/t1

    Distributions of the dijet mass. The processes $t\bar{t}$(allHad), $tW$, Single top, $t\bar{t}H$, Other top, $W$ + jets, $Z$ + jets,...

  • Yields

    Table 3 from the publication

    10.17182/hepdata.154176.v1/t2

    Data and background yields after the background-only fit of the BDT-score distribution for the $130\,$GeV signal mass BDT training. For...

  • Limits

    Tabulated data from Figure 6 in the publication

    10.17182/hepdata.154176.v1/t3

    Observed (solid line) and expected (dotted line) upper limits on $\mathscr{B}_{H^{\pm}}$ for charged Higgs boson with masses between $60\,$GeV and...

  • Acceptance times Efficiency

    Tabulated data from Auxiliary Figure 1 in the publication. Auxiliary Figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2020-11/.

    10.17182/hepdata.154176.v1/t4

    Signal selection efficiency times acceptance for charged Higgs boson with masses between $60\,$GeV to $168\,$GeV. The efficiency times acceptance drops...

  • Fit Parameters

    Tabulated data from Auxiliary Figure 7. Auxiliary Figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2020-11/.

    10.17182/hepdata.154176.v1/t5

    Best fit values of $\mu_{t\bar{t}}$ and $f_{\mathrm{HF}}$ parameters at charged Higgs masses between $60\,$GeV and $168\,$GeV.

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