New decay modes of gravitino dark matter

Details New decay modes of gravitino dark matter New decay modes of gravitino dark matter

2010-03-17

arxiv.org/abs/1003.3401v1

Phys.Rev.D82:015008,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 5 figures

Scientific paper

10.1103/PhysRevD.82.015008

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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