Mixed sneutrino dark matter in light of the 2011 XENON and LHC results
  In the context of supersymmetric models in which small Dirac neutrino masses
are generated by supersymmetry breaking, a mainly right-handed (RH) mixed
sneutrino can be an excellent cold dark matter (DM) candidate. We perform a
global analysis of the Minimal Supersymmetric Standard Model (MSSM)+RH neutrino
parameter space by means of Markov Chain Monte Carlo scans. We include all
relevant constraints from collider and dark matter searches, paying particular
attention to nuclear and astrophysical uncertainties. Two distinct cases can
satisfy all constraints: heavy sneutrino DM with mass of order 100 GeV, as well
as light sneutrino DM with mass of about 3-6 GeV. We discuss the implications
for direct and indirect dark matter searches, as well as for SUSY and Higgs
searches at the LHC for both, the light and the heavy sneutrino dark matter
case. The light sneutrino case is excluded by the 125-126 GeV Higgs signal.
