Abstract
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.
Highlights
There are many theoretical or aesthetical arguments for the necessity of TeV-scale new physics, the most convincing evidence is from the Wilkinson Microwave Anisotropy Probe WMAP observation of the cosmic cold dark matter, which naturally indicates the existence of weakly interacting massive particles WIMPs beyond the prediction of the standard model SM
The TeV-scale new physics to be unraveled at the large hadron collider LHC is the most likely related to the WIMP dark matter
If WIMP dark matter is chosen by nature, it will give a strong argument for low-energy supersymmetry SUSY with R parity which can give a good candidate
Summary
There are many theoretical or aesthetical arguments for the necessity of TeV-scale new physics, the most convincing evidence is from the Wilkinson Microwave Anisotropy Probe WMAP observation of the cosmic cold dark matter, which naturally indicates the existence of weakly interacting massive particles WIMPs beyond the prediction of the standard model SM. An effective μ can be reasonably getten at EW scale when S denotes the vacuum expectation value VEV of the singlet field Among these extension models the next-to-minimal supersymmetric model NMSSM 4–27 and the nearly minimal supersymmetric model nMSSM 28–37 caused much attention recently. These singlet multiplets compose a “singlet sector” of the MSSM It can make the phenomenologies of SUSY dark matter and Higgs different from the MSSM. Though CoGeNT result is not consistent with the CDMS or XENON results, it implies that the mass of dark matter can range a very long scope at EW scale, that is, from a few GeV to several TeV. We will give a short review on the difference between the MSSM and the MSSM with a singlet sector under the constraints of new dark matter detection results.
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