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

A bstract We explored the prospect of looking for a fermiophobic charged Higgs ( H ± ) 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 H ± with the Standard Model fermions is inversely proportional to tan β . Almost all the experimental searches rely on the fermionic production and decay of the charged Higgs. Consequently, the limit on H ± for fermiophobic scenarios is non-existent unless tan β is small. We show that for a fermiophobic case, the electroweak production of H ± 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 tan β regions.