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Title: Antiproton limits on decaying gravitino dark matter

We derive 95 % CL lower limits on the lifetime of decaying dark matter in the channels Zν, Wℓ 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 × 10{sup 28} s to 5 × 10{sup 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{sup −8} to 8 × 10{sup −13}.
Authors:
 [1] ;  [2]
  1. LAPTh, Université de Savoie, CNRS, BP 110, F-74941 Annecy-le-Vieux Cedex (France)
  2. Instituto de Física Teórica UAM/CSIC and Departamento de Física Teórica, Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid (Spain)
Publication Date:
OSTI Identifier:
22369828
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 12; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANTIPROTONS; COSMIC RADIATION; COSMIC RAY PROPAGATION; COUPLING; GEV RANGE; LIFETIME; LIMITING VALUES; MASS; NONLUMINOUS MATTER; PARITY; PARTICLE DECAY; TEV RANGE 01-10