Dipolar dark matter

被引：100

作者：

Masso, Eduard ^{[1
]}

Mohanty, Subhendra ^{[2
]}

Rao, Soumya ^{[2
]}

机构：

[1] Univ Autonoma Barcelona, Fis Teor Grp, Bellaterra 08193, Spain

[2] Phys Res Lab, Ahmadabad 380009, Gujarat, India

来源：

PHYSICAL REVIEW D | 2009年 / 80卷 / 03期

关键词：

D O I：

10.1103/PhysRevD.80.036009

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

If dark matter (DM) has nonzero direct or transition, electric or magnetic dipole moment then it can scatter nucleons electromagnetically in direct detection experiments. Using the results from experiments like XENON, CDMS, DAMA, and COGENT, we put bounds on the electric and magnetic dipole moments of DM. If DM consists of Dirac fermions with direct dipole moments, then DM of mass less than 10 GeV is consistent with the DAMA signal and with null results of other experiments. If on the other hand DM consists of Majorana fermions then they can have only nonzero transition moments between different mass eigenstates. We find that Majorana fermions with masses 38 less than or similar to m(chi) less than or similar to 100-200 GeV and mass splitting of the order of (150-200) keV can explain the DAMA signal and the null observations from other experiments and in addition give the observed relic density of DM by dipole-mediated annihilation. The absence of the heavier DM state in the present Universe can be explained by dipole-mediated radiative decay. This parameter space for the mass and for dipole moments is allowed by limits from L3 but may have observable signals at LHC.

引用

页数：8

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