Dependence of the leptonic decays of H^{±} on the neutrino mixing angles θ_{13} and θ_{23} in models with neutrinophilic charged scalars
Abstract
In the Higgs Triplet Model and the neutrinophilic TwoHiggsDoublet 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 sin^{2} 2θ_{13}, 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 m_{0}<10^{3} eV. We also discuss the sizeable dependence of H^{±}→μ^{±}ν and H^{±}→τ^{±}ν on sin^{2} θ_{23}, which would enable information to be obtained on sin^{2} θ_{23} and the sign of Δm312 if these decays are measured. Such information would help neutrino oscillation experiments to determine the CPviolating phase δ.
 Publication:

Physics Letters B
 Pub Date:
 January 2014
 DOI:
 10.1016/j.physletb.2013.11.032
 arXiv:
 arXiv:1308.0230
 Bibcode:
 2014PhLB..728..157A
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 17 pages, 6 figures