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Minimal Dirac Fermionic Dark Matter with Nonzero Magnetic Dipole Moment

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arxiv 0901.3815 v2 pith:CNN4P52G submitted 2009-01-25 hep-ph astro-ph.HE

Minimal Dirac Fermionic Dark Matter with Nonzero Magnetic Dipole Moment

classification hep-ph astro-ph.HE
keywords dipolemagneticmomentcandidatediracneardarkdetection
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A neutral Dirac fermion is supplied as a singlet within the context of the standard model (SM) and is considered as a dark matter (DM) candidate near electroweak scale (10-1000 GeV) with nonzero magnetic dipole moment. The Dirac particles have four different types of electromagnetic couplings (four form factors) in general. We predict that the candidate mainly interacts with SM particles through magnetic dipole moment (MDM), since MDM conserves the discrete symmetries like parity (P), time reversal (T), and charge conjugation (C) or its combination CP. The magnetic dipole moment constrained by the relic density may be as large as 10^(-18)-10^(-17)e cm. We show that the elastic scattering is due to a spin-spin interaction for the direct detection, and the candidate with mass near electroweak scale is under experimental limits of the current direct detectors, XENON10 and CDMS II. We also consider the possibility of WIMP detection in near future.

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