Same sign trilepton as signature of charged Higgs in two Higgs doublet model

TL;DR

This paper investigates the potential of using same sign trilepton signals at the LHC to detect fermiophobic charged Higgs bosons within the type-I two Higgs doublet model, especially in high $ b$ regions.

Contribution

It introduces a novel search strategy based on electroweak production and bosonic decay channels for fermiophobic charged Higgs, complementing existing fermionic search methods.

Findings

Electroweak production dominates in fermiophobic scenarios.

Same sign trilepton signal effectively probes high $ b$ regions.

Provides a new avenue for charged Higgs detection at the LHC.

Abstract

We explored the prospect of looking for a fermiophobic charged Higgs ($\hpm$) via the same sign trilepton signal at the LHC. A fermiophobic scenario appears in the type-I two Higgs doublet model where the coupling of the $\hpm$ with the Standard Model fermions is inversely proportional to $\tb$. Almost all the experimental searches rely on the fermionic production and decay of the charged Higgs. Consequently, the limit on $\hpm$ for fermiophobic scenarios is non-existent unless $\tb$ is small. We show that for a fermiophobic case, the electroweak production of $\hpm$ is dominant for most of the parameter space. Subsequent bosonic decay of the charged and neutral Higgses give rise to the same sign trilepton signal. With a thorough phenomenological analysis, we demonstrate that the same sign trilepton signal can be an excellent complementary search to explore the high $\tb$ regions.