Abstract
Type-X two Higgs doublet model is known to explain the muon g − 2 anomaly with a relatively light charged Higgs boson at large tan β. The light charged Higgs boson has been searched in the main τ ν mode at the colliders. Invoking a scenario of inverse seesaw as the origin of neutrino masses and mixing, the charged Higgs boson can decay additionally to right-handed neutrinos which leads to interesting phenomenology. Considering generic lepton flavour violating signatures at the final states, a 5σ discovery can be achieved with the early data of LHC, at 14 TeV, for relatively large inverse seesaw Yukawa coupling YN. The very light pseudoscalar and charged Higgs boson mass reconstruction are performed using the new modes and the results look promising. The inverse seesaw Yukawa coupling is shown to be probed down to YN ∼ 0.2 at HL LHC with 3000 fb−1.
Highlights
This decay mode of charged Higgs has been looked into for Type-I and Type-II 2HDM scenarios [11,12,13]
The right-handed neutrinos decays to charged Higgs can be seen in the context of other scenarios [23, 24] but can only be enhance in inverse-seesaw case due to relatively large Yukawa coupling In this article we are mostly interested in probing the decay modes with charged lepton, gauge boson and the pseudoscalar, which is generic in Type X 2HDM, at the LHC
Given the mass spectrum for BP1 in table 1, the heavy Higgs can decay to Niνi and the light pseudoscalar dominantly decays to tau anti-tau pair giving rise to di-tau plus opposite sign dilepton (OSD) final states as shown in eq (3.1), where the leptons can be of different flavours
Summary
We consider three generations of NR and S2, the two Majorana neutrinos forming a pseudoDirac fermion, which are singlet under the SM gauge group. −i sin α qLHqR : − v sin β muuLHuR + mddLHdR + h.c. as we are interested in Type-X 2HDM, the choice of interaction term of the RHN with the Higgs doublets is very crucial. −YN√cos 2 β νLANR + h.c. It can be seen that in high tan β region, the decay modes H± → LNR and NR → AνL, which are of our special interests, are enhanced only in Type-X extension and we examine the Type-X extension with RHNs in the rest of the paper. We note that the decay H± → AW ± is governed only by the weak gauge coupling g2 in all 2HDM scenarios, due to the dependency of H± → LNR on tan β values, the partial branching fraction for H± → AW ± may vary which has important consequences in collider studies explored in the subsequent sections
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