A Comparative Study of Dark Matter in the MSSM and Its Singlet Extensions: A Mini Review

In this note we briefly review the recent studies of dark matter in the MSSM and its singletextensions: the NMSSM, the nMSSM, and the general singlet extension. Under the new detectionresults of CDMS II, XENON, CoGeNT, and PAMELA, we find that (i) the latest detection resultscan exclude a large part of the parameter space which is allowed by current collider constraints inthese models. The future SuperCDMS and XENON can cover most of the allowed parameterspace; (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 lightdark matter at several GeV to exist. Light CP-even or CP-odd Higgs boson must be present so asto satisfy the measured dark matter relic density. In case of the presence of a light CP-even Higgsboson, 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 densityand the PAMELA result through the Sommerfeld-enhanced annihilation. Higgs decays in differentscenario are also studied