Gamma Rays from Heavy Neutralino Dark Matter

Details Gamma Rays from Heavy Neutralino Dark Matter Gamma Rays from Heavy Neutralino Dark Matter

2005-07-19

arxiv.org/abs/hep-ph/0507229v2

Phys.Rev.Lett. 95 (2005) 241301

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 figures; revised to match published version

Scientific paper

10.1103/PhysRevLett.95.241301

We consider the gamma-ray spectrum from neutralino dark matter annihilations and show that internal bremsstrahlung of W pair final states gives a previously neglected source of photons at energies near the mass of the neutralino. For masses larger than about 1 TeV, and for present day detector resolutions, this results in a characteristic signal that may dominate not only over the continuous spectrum from W fragmentation, but also over the \gamma-\gamma and \gamma-Z line signals which are known to give large rates for heavy neutralinos. Observational prospects thus seem promising.

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