Charged Higgs phenomenology in the lepton-specific two Higgs doublet model

TL;DR

This paper analyzes the lepton-specific two Higgs doublet model, focusing on constraints for the charged Higgs boson mass and tan(beta), and discusses potential discovery prospects at the LHC.

Contribution

It provides the first comprehensive analysis of experimental constraints on the charged Higgs in the lepton-specific 2HDM and explores its collider phenomenology.

Findings

LEP-II sets a lower bound of 92.0 GeV on M_H+

Two allowed regions for M_H+ depending on tan(beta)

Discussion of charged Higgs decay modes and LHC prospects

Abstract

We study the "lepton-specific" two Higgs doublet model, in which one doublet Phi_l gives mass to charged leptons and the other Phi_q gives mass to both up- and down-type quarks. We examine the existing experimental constraints on the charged Higgs boson mass and the parameter tan(beta) \equiv <Phi_q^0>/<Phi_l^0>. The most stringent constraints come from LEP-II direct searches and lepton flavour universality in tau decays. The former yields M_H+ \geq 92.0 GeV; the latter yields two allowed regions, 0.61 tan(beta) GeV \leq M_H+ \leq 0.73 tan(beta) GeV or M_H+ \geq 1.4 tan(beta) GeV, and excludes parameter regions beyond the LEP-II bound for tan(beta) \gtrsim 65. We present the charged Higgs decay branching fractions and discuss prospects for charged Higgs discovery at the LHC in this model.