GeV seesaw, accidentally small neutrino masses, and Higgs decays to neutrinos
Jun, 2007Citations per year
Abstract: (arXiv)
If the Standard Model particle content is extended by gauge singlet fermions (right-handed neutrinos), active neutrinos generically acquire (Majorana) masses, in agreement with our current understanding of the lepton sector. If the right-handed neutrino masses are of the same order as the electroweak symmetry breaking scale, it is usually expected that these will not mediate any experimentally observable effects. Here, I explore the fact that this is not necessarily the case. If neutrino masses are 'accidentally small', active-sterile mixing angles can, according to current experimental bounds, be as large as several percent. If this is the case, I argue that the dominant decay mode of light (M_H less than 130 GeV) Higgs bosons could be into an active and a sterile neutrino. The sterile neutrino decays promptly into a charge lepton and an on- or off-shell W-boson, so that the dominant Higgs boson decay mode is H to leptons + jets + missing transverse energy.- seesaw model
- coupling: Yukawa
- neutrino: mass
- neutrino: right-handed
- neutrino: mixing angle
- neutrino: sterile
- Higgs particle: decay modes
- Higgs particle: width
- Higgs particle: branching ratio
- neutrino: emission
References(56)
Figures(0)