| THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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A Simple Singlet Fermionic Dark-Matter Model Revisited |
| QIN Hong-Yi**, WANG Wen-Yu, XIONG Zhao-Hua
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Institute of Theoretical Physics, Beijing University of Technology, Beijing 100124
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| Cite this article: |
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QIN Hong-Yi, WANG Wen-Yu, XIONG Zhao-Hua 2011 Chin. Phys. Lett. 28 111202 |
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Abstract We evaluate the spin-independent elastic dark matter-nucleon scattering cross section in the framework of the simple singlet fermionic dark matter extension of the standard model and constrain the model parameter space with the following considerations: (i) new dark matter measurement, in which, apart from WMAP and CDMS, the results from the XENON experiment are also used in constraining the model; (ii) new fitted value of the quark fractions in nucleons, in which the updated value of fTs from the recent lattice simulation is much smaller than the previous one and may reduce the scattering rate significantly; (iii) new dark matter annihilation channels, in which the scenario where top quark and Higgs pairs produced by dark matter annihilation was not included in the previous works. We find that unlike in the minimal supersymmetric standard model, the cross section is just reduced by a factor of about 1/4 and dark matter lighter than 100 GeV is not favored by the WMAP, CDMS and XENON experiments.
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| Keywords:
12.60.-i
95.35.+d
14.80.Cp
12.60.Fr
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Received: 30 April 2011
Published: 30 October 2011
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