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 via the same sign trilepton signal at the LHC. Such a fermiophobic scenario appears in type-I two Higgs doublet model where the fermionic couplings of the charged Higgs are inversely proportional to tan β. Almost all the experimental searches rely on the fermionic production and decay of the charged Higgs, and the limit on charge Higgs is non-existent unless tan β is small. We show that for a fermiophobic case, the electroweak production is dominant for most of the parameter space, and the subsequent bosonic decay of the charged and neutral Higgs will give rise to the same sign trilepton signal. By doing a thorough phenomenological analysis, we show that the same sign trilepton can be an excellent complementary search and can explore the large tan β regions.

Searching for light new physics at the LHC via lepton-number violation

“…We also study the discovery potential at the LHC of this model, proposing a same-sign three-lepton (SS3L) search. Such a final state has been considered in the phenomenology literature [19][20][21][22][23][24] in the context of other models, some of which are lepton-number conserving, but as far as we are aware, there has been no experimental search for this signature. We do a detailed analysis of the background, taking into account both fake leptons and charge mismeasurement, and map out the discovery potential of the LHC using conservative background assumptions.…”