Pragmatic approach to the little hierarchy problem - the case for Dark Matter and neutrino physics

by Bohdan Grzadkowski

Thursday 14 May 2009, 11:00 → 12:00 Europe/Zurich

1/1-025 (CERN)

We show that the addition of a single real scalar (gauge singlet) to the Standard Model can both ameliorate the little hierarchy problem and provide a realistic Dark Matter candidate. To this end, the coupling of the new scalar to the standard Higgs boson must be relatively strong, (still well below the perturbativity limit) and its mass should be in the $10-30\tev$ range, while the lowest cutoff of the (unspecified) UV completion must be $ \gesim 50\tev$, depending on the Higgs boson mass. The presence of the new singlet also leads to realistic and surprisingly reach neutrino physics. The resulting light neutrino mass spectrum and mixing angles are consistent with the constraints from the neutrino oscillations.