Dependence of the leptonic decays of H± on the neutrino mixing angles Θ13 and Θ23 in models with neutrinophilic charged scalars

Abstract

In the Higgs Triplet Model and the neutrinophilic Two-Higgs-Doublet Model the observed neutrinos obtain mass from a vacuum expectation value which is much smaller than the vacuum expectation value of the Higgs boson in the Standard Model. Both models contain a singly charged Higgs boson (H±) whose Yukawa coupling is directly related to the neutrino mass (i.e. a "neutrinophilic charged Higgs"). The partial decay widths of H± into a charged lepton and a neutrino (H±→l±ν) depend identically on the neutrino masses and mixings in the two models. We quantify the impact of the recent measurement of sin22Θ13, which plays a crucial role in determining the magnitude of the branching ratio of H±→e±ν for the case of a normal neutrino mass ordering if the lightest neutrino mass m0 < 10-3 eV. We also discuss the sizeable dependence of H±→μ±ν and H±→τ±ν on sin2Θ23, which would enable information to be obtained on sin2Θ23 and the sign of Δm231 if these decays are measured. Such information would help neutrino oscillation experiments to determine the CP-violating phase δ. © 2013 The Authors. Published by Elsevier B.V.