We present an $R$-parity conserving model of sneutrino dark matter within a Higgsphilic $U(1{)}^{\prime }$ extension of the minimal supersymmetric standard model. In this theory, the $\mu$ parameter and light Dirac neutrino masses are generated naturally upon the breaking of the $U(1{)}^{\prime }$ gauge symmetry. One of the right-handed sneutrinos is the lightest supersymmetric particle. The leptonic and hadronic decays of another sneutrino, taken to be the next-to-lightest superpartner, allow for a natural fit to the recent results reported by the PAMELA experiment. We perform a detailed calculation of the dark matter relic density in this scenario, and show that the model is consistent with the ATIC and Fermi LAT experiments.

• Received 23 June 2009

DOI:https://doi.org/10.1103/PhysRevD.81.035019