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

Akeroyd, A.G., Moretti, S. and Sugiyama, Hiroaki (2013) Dependence of the leptonic decays of H^- on the neutrino mixing angles θ₁₃ and θ₂₃ in models with neutrinophilic charged scalars. arXiv, (arXiv:1308.0230), 1-17.

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^± to ℓ^± ν) depend identically on the neutrino masses and mixings in the two models. We quantify the impact of the recent measurement of sin² 2θ₁₃, which plays a crucial role in determining the magnitude of the branching ratio of H^± to 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^± to μ^± ν and H^± to τ^± ν on sin²θ₂₃, which would enable information to be obtained on sin²θ₂₃ and the sign of Δ m²₃₁ if these decays are measured. Such information would help neutrino oscillation experiments to determine the CP-violating phase δ.

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