Dependence of the leptonic decays of H± on the neutrino mixing angles θ13 and θ23 in models with neutrinophilic charged scalars

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(+/-) nu) depend identically on the neutrino masses and mixings in the two models. We quantify the impact of the recent measurement of sin(2) 2 theta(13), which plays a crucial role in determining the magnitude of the branching ratio of H-+/- -> e(+/-) v for the case of a normal neutrino mass ordering if the lightest neutrino mass m(0) < 10(-3) eV. We also discuss the sizeable dependence of H-+/- -> mu(+/-) nu and H-+/- -> tau(+/-) nu on sin(2) theta(23), which would enable information to be obtained on sin(2) 2 theta(23) and the sign of Delta m(31)(2) if these decays are measured. Such information would help neutrino oscillation experiments to determine the CP-violating phase delta. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.