We propose a minimal extension of the standard model by two real singlet fields that could provide a good candidate for light dark matter, and give a strong first order electroweak phase transition. As a result, there are two CP even scalars: one is lighter than ∼70GeV, and the other one with mass in the range ∼280-400GeV, and consistent with electroweak precision tests. We show that the light scalar mass can be as small as 25 GeV while still being consistent with the LEP data. The predicted dark matter scattering cross-section is large enough to accommodate CoGeNT and can be probed by future XENON experiment. We also show that for dark matter mass around 2 GeV, the branching fraction of the process (B +→K ++2(DM)) can be accessible in SuperB factories.
|Physical Review D - Particles, Fields, Gravitation and Cosmology
|Published - May 14 2012
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)