Detection of Leptonic Dark Matter

Details Detection of Leptonic Dark Matter Detection of Leptonic Dark Matter

2002-11-20

arxiv.org/abs/hep-ph/0211325v1

Phys.Rev. D67 (2003) 043516

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 3 figures

Scientific paper

10.1103/PhysRevD.67.043516

Weakly interacting massive particles (WIMPs) are among the favored candidates for cold dark matter in the universe. The phenomenology of supersymmetric WIMPs has been quite developed during recent years. However, there are other possibilities which have not been discussed as much. One example is a right-handed massive neutrino, which has recently been proposed in the context of a version of the Zee model for massive neutrinos. This TeV-scale, leptonic WIMP (or LIMP, for short) may at first sight appear to be essentially undetectable. However, we point out that the radiatively induced annihilation rate into leptons and photons is bound to be substantial, and provides a conspicuous gamma-ray signature for annihilations in the galactic halo. This gives a window of opportunity for Air Cerenkov Telescopes with ability to observe the galactic center, such as the HESS and CANGAROO arrays, and also for the GLAST space telescope. In addition, the contribution to the positron cosmic ray flux is in principle detectable, but this would require very strong local density enhancements in the dark matter halo distribution.

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