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New decay modes of gravitino dark matter.

Submitted on: Thu, 15/04/2010 - 09:45 — cyaguna
Preprint info
IFT Number: 
IFT-UAM/CSIC-10-20
New decay modes of gravitino dark matter., Ki-Young Choi; Carlos E. Yaguna , Volume D82, Phys.Rev.D82:015008,2010. , p.015008, (Submitted)

We consider the three-body decays of gravitino dark matter in supersymmetric scenarios with bilinear R-parity violation. In particular, gravitino decays into lepton+W^* (lepton f\bar f') and \nu+Z^* (\nu f\bar f) are examined for gravitino masses below Mw. After computing the gravitino decay rates into these three-body final states and studying their dependence on supersymmetric parameters, we find that these new decay modes are often more important than the two-body decay, into a photon and a neutrino, considered in previous works. Consequently, the gravitino lifetime and its branching ratios are substantially modified, with important implications for the indirect detection of gravitino dark matter.

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