摘要：In this note we briefly review the recent studies of dark matter in the MSSM and its singlet
extensions: the NMSSM, the nMSSM, and the general singlet extension. Under the new detection
results of CDMS II, XENON, CoGeNT, and PAMELA, we find that (i) the latest detection results
can exclude a large part of the parameter space which is allowed by current collider constraints in
these models. The future SuperCDMS and XENON can cover most of the allowed parameter
space; (ii) the singlet sector will decouple from the MSSM-like sector in the NMSSM; however,
singlet sector makes the nMSSM quite different from the MSSM; (iii) the NMSSM can allow light
dark matter at several GeV to exist. Light CP-even or CP-odd Higgs boson must be present so as
to satisfy the measured dark matter relic density. In case of the presence of a light CP-even Higgs
boson, the light neutralino dark matter can explain the CoGeNT and DAMA/LIBRA results; (iv)
the general singlet extension of the MSSM gives a perfect explanation for both the relic density
and the PAMELA result through the Sommerfeld-enhanced annihilation. Higgs decays in different
scenario are also studied.
