Right-handed sneutrino as thermal dark matter

Abstract

We study an extension of the MSSM with a singlet S with coupling SH1H2 in order to solve the mu problem as in the NMSSM, and right-handed neutrinos N with couplings SNN in order to generate dynamically electroweak-scale Majorana masses. We show how in this model a purely right-handed sneutrino can be a viable candidate for cold dark matter in the Universe. Through the direct coupling to the singlet, the sneutrino can not only be thermal relic dark matter but also have a large enough scattering cross section with nuclei to detect it directly in near future, in contrast with most of other right-handed sneutrino dark matter models.

5 pages, 2 figures. References added and minor changes. Final version to appear in Phys. Rev. D

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• Lepton Flavour Violation and theta(13) in Minimal Resonant Leptogenesis
• Light Dark Matter from the U(1)_X Sector in the NMSSM with Gauge Mediation
• Right-handed sneutrino dark matter in the NMSSM
• Light mixed sneutrinos as thermal dark matter
• NMSSM and Seesaw Physics at LHC
• Light neutralino dark matter with a very light Higgs for CoGeNT and DAMA/LIBRA data
• A possible connection between neutrino mass generation and the lightness of a NMSSM pseudoscalar
• Neutrinos as cosmic messengers