From realistic 2HDM-II CPV benchmarks to the $H^\pm \to\tau \nu$ decay at the LHC

TL;DR

This paper updates the viable parameter space of a CP-violating two-Higgs-doublet model based on recent LHC data and analyzes the LHC's potential to discover charged Higgs bosons decaying to tau neutrinos through various production channels.

Contribution

It provides the first comprehensive analysis of the LHC's sensitivity to charged Higgs bosons in a CP-violating 2HDM-II, considering multiple production modes and recent experimental constraints.

Findings

Updated parameter space consistent with LHC data.

Identified promising channels for charged Higgs discovery.

Performed signal-over-background analysis for fermion-associated production.

Abstract

Phenomenological studies of a CP-violating two-Higgs-doublet Model with type-II Yukawa couplings are presented. In the light of recent LHC data, an update on the viable parameter space that survives both the experimental and theoretical constraints is provided. In addition, the scope of the LHC in exploring this model through the discovery of a charged Higgs boson that decays in the tauonic mode is analysed. For this, various production channels were investigated, with emphasis on the boson-associated channel $gg\to H_i\to H^\pm W^\mp$ and the fermion-associated channels $gb\to H^\pm t$ and $gg\to H^\pm bt$. For the latter, a signal-over-background analysis is performed.