Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-04-19
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 4 figures, figures updated and references added, accepted for publication in PRD
Scientific paper
In a recent paper, four of the present authors proposed a class of dark matter models where generalized parity symmetry leads to equality of dark matter abundance with baryon asymmetry of the Universe and predicts dark matter mass to be around 5 GeV. In this note we explore how this model can be tested in direct search experiments. In particular, we point out that if the dark matter happens to be the mirror neutron, the direct detection cross section has the unique feature that it increases at low recoil energy unlike the case of conventional WIMPs. It is also interesting to note that the predicted spin-dependent scattering could make significant contribution to the total direct detection rate, especially for light nucleus. With this scenario, one could explain recent DAMA and CoGeNT results.
An Haipeng
Chen Shao-Long
Mohapatra Rabindra N.
Nussinov Shmuel
Zhang Yue
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