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arXiv · 1305.7183

Antiproton Limits on Decaying Gravitino Dark Matter

Timur Delahaye·Michael Grefe
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Abstract

We derive 95% CL lower limits on the lifetime of decaying dark matter in the channels $Zν$, $W\ell$ and $hν$ 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 $8 \times 10^{28}$s to $5 \times 10^{25}$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 $10^{-8}$ to $8 \times 10^{-13}$.

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Timur Delahaye, Michael Grefe. 2014-01-07. Antiproton Limits on Decaying Gravitino Dark Matter. https://doi.org/10.1088/1475-7516/2013/12/045

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