Charged-Higgs production in the Two-Higgs-Doublet Model --- the \tau\nu channel

TL;DR

This paper updates the parameter space of the CP-violating 2HDM with Type II Yukawa couplings and analyzes the potential for discovering charged Higgs bosons via the tau nu decay channel at current and future colliders.

Contribution

It provides a detailed analysis of charged Higgs production mechanisms and decay modes within the CP-violating 2HDM, including a signal-over-background study at parton level.

Findings

CP violation marginally increases discovery prospects.

Charged Higgs detection remains challenging at higher energies.

Parameter space extension due to CP violation is significant.

Abstract

We update the allowed parameter space of the CP-violating 2HDM with Type II Yukawa couplings, that survives the current experimental and theoretical constraints on the model. For a representative set of allowed parameter points, we study the production of charged Higgs bosons, both at the LHC at 14 TeV and at a possible future hadronic collider at 30 TeV. Two classes of production mechanisms are considered, "bosonic" (pp\to H^\pm W^\mp X) and "fermionic" (pp \to H^+ \bar t (b) X). After commenting on our previous H^\pm\to W^\pm H_1 investigation, we focus on the tauonic decay mode, H^\pm \to \tau\nu, performing a detailed signal-over-background analysis at the parton level. The increased features provided when considering CP violation, i.e., the extension of the parameter space and the mixing of the would-be CP-odd scalar boson, only marginally increase the discovery prospects, which remain very challenging both when increased luminosities and higher energies are considered.