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

Abstract

We explored the prospect of looking for a fermiophobic charged Higgs ($\text{hpm}$) 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 $\text{hpm}$ with the Standard Model fermions is inversely proportional to $\text{tb}$. Almost all the experimental searches rely on the fermionic production and decay of the charged Higgs. Consequently, the limit on $\text{hpm}$ for fermiophobic scenarios is non-existent unless $\text{tb}$ is small. We show that for a fermiophobic case, the electroweak production of $\text{hpm}$ 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 $\text{tb}$ regions.

Comments: 19 pages, 6 figures, 3 tables