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Search for a light charged Higgs boson in $t \rightarrow H^{\pm}b$ decays, with $H^{\pm} \rightarrow cb$, in the lepton+jets final state in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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abstract
A search for a charged Higgs boson, $H^{\pm}$, produced in top-quark decays, $t \rightarrow H^{\pm}b$, is presented. The search targets $H^{\pm}$ decays into a bottom and a charm quark, $H^{\pm} \rightarrow cb$. The analysis focuses on a selection enriched in top-quark pair production, where one top quark decays into a leptonically decaying $W$ boson and a bottom quark, and the other top quark decays into a charged Higgs boson and a bottom quark. This topology leads to a lepton-plus-jets final state, characterised by an isolated electron or muon and at least four jets. The search exploits the high multiplicity of jets containing $b$-hadrons, and deploys a neural network classifier that uses the kinematic differences between the signal and the background. The search uses a dataset of proton-proton collisions collected at a centre-of-mass energy $\sqrt{s}=13$ TeV between 2015 and 2018 with the ATLAS detector at CERN's Large Hadron Collider, amounting to an integrated luminosity of 139 fb$^{-1}$. Observed (expected) 95% confidence-level upper limits between 0.15% (0.09%) and 0.42% (0.25%) are derived for the product of branching fractions $\mathscr{B}(t\rightarrow H^{\pm}b) \times \mathscr{B}(H^{\pm}\rightarrow cb)$ for charged Higgs boson masses between 60 and 160 GeV, assuming the SM production of the top-quark pairs.
Forward citations
Cited by 6 Pith papers
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Charged Higgs Search at Future Neutrino Telescope and Higgs Factory
Future lepton colliders can discover a charged Higgs below about half their energy, while multi-cubic-kilometer neutrino telescopes add complementary reach for heavier charged Higgs masses.
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Charged Higgs Decay to Bottom and Charm Quarks from $Z_3$-Flavored Two Higgs Doublet Models
A Z3-flavored two-Higgs-doublet model admits benchmark points with enhanced H±→cb decay that match the ATLAS 130 GeV excess and could be probed at the LHeC.
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Probing one-loop--induced decay channel $H^\pm \to W^\pm\gamma$ in the Two Higgs Doublet Models at muon-TeV colliders
The one-loop decay H±→W±γ is re-derived in the general Rξ gauge and used to predict that a 3 TeV muon collider could see a charged Higgs signal, though the conclusion reports only 2 sigma for several benchmarks.
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Phenomenology of scalar particles assisted by machine learning
The thesis projects 5-sigma discovery reaches at the HL-LHC for charged Higgs pairs, Flavon decays, and h->eµ, using BDT-based event selection in the 2HDM-III and Froggatt-Nielsen models.
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