Charged Higgs decays in models with singlet neutrino in large extra dimensions
Abstract
In models with large extra dimensions and TeV scale quantum gravity, small (Dirac) neutrino masses can be obtained naturally if the right-handed neutrino propagates in the extra dimensions. In this scenario, with 2 Higgs doublets, we show that the decay of charged Higgs into left-handed charged lepton (say τ) and right-handed neutrino can be significantly enhanced, with O(1) branching ratio, due to the large number of Kaluza-Klein states of the right-handed neutrino. Since τ's from the standard decay of charged Higgs are right-handed, the above novel charged Higgs decay can provide a distinctive signature of these models at hadron/lepton colliders. Similarly, top quark decays to b μ+ , b τ+ through virtual charged Higgs can be enhanced.
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