1305.7183 (Timur Delahaye et al.)

Antiproton Limits on Decaying Gravitino Dark Matter    [PDF]

Timur Delahaye, Michael Grefe

We derive 95% CL lower limits on the lifetime of decaying dark matter in the channels Z{\nu}, Wl and h{\nu} using measurements of the cosmic-ray antiproton flux by the PAMELA experiment. Performing a scan over the allowed range of cosmic-ray propagation parameters we find lifetime limits in the range of 10^28 s to 2 x 10^25 s for dark matter masses from roughly 100 GeV to 10 TeV. We apply these limits to the well-motivated case of gravitino dark matter in scenarios with bilinear violation of R-parity and find a similar range of lifetime limits for the same range of gravitino masses. Converting the lifetime limits to constraints on the size of the R-parity violating coupling we find upper limits in the range of 3 x 10^-8 to 10^-12.

View original: http://arxiv.org/abs/1305.7183