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Hunting a charged Higgs boson pair in proton-proton collisions (2405.06036v2)

Published 9 May 2024 in hep-ph

Abstract: We explore the production and possible detection of a charged scalar Higgs pair $H-H+$ decaying into the final state $\mu\nu_{\mu}cb$ in proton-proton collisions at the LHC and its next step, the High Luminosity LHC (HL-LHC). The charged scalars are predicted within the theoretical framework of the Two-Higgs Doublet Model of type III (2HDM-III). As a test and validation of the model, we identify regions of the 2HDM-III parameter space that accommodate the current excess of events at $3\sigma$ in the process $\mathcal{BR}(t\to H{\pm}b)\times \mathcal{BR}(H{\pm}\to cb)$ for $M_{H{\pm}}=130$ GeV, as reported by the ATLAS collaboration. Theoretical and additional experimental constraints are also included. Based on this, we propose realistic scenarios that could be brought under experimental scrutiny at the HL-LHC. Assuming the most favorable scenario, we predict a signal significance at the level of $5\sigma$ for a charged scalar boson mass $M_{H{\pm}}$ in the $100-350$ GeV range.

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