Gamma rays from heavy neutralino dark matter.
We consider the gamma-ray spectrum from neutralino dark matter annihilations and show that internal bremsstrahlung of 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 gammagamma and gammaZ line signals which are known to give large rates for heavy neutralinos. Observational prospects thus seem promising.
Bergström
Lars
L
Department of Physics, Stockholm University, AlbaNova University Center, SE - 106 91 Stockholm, Sweden. lbe@physto.se
Bringmann
Torsten
T
Eriksson
Martin
M
Gustafsson
Michael
M