New decay modes of gravitino dark matter

Abstract

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 ν+Z^* (νf\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.

4 pages, 5 figures

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• MeV-GeV $\gamma$-ray telescopes probing axino LSP/gravitino NLSP as dark matter in the $\mu \nu$SSM
• Search for sharp and smooth spectral signatures of $\mu \nu$SSM gravitino dark matter with Fermi-LAT
• Gravitino Dark Matter and Neutrino Masses in Partial Split Supersymmetry
• Antiproton Limits on Decaying Gravitino Dark Matter
• Unstable Gravitino Dark Matter - Prospects for Indirect and Direct Detection
• Proceedings of the first workshop on Flavor Symmetries and consequences in Accelerators and Cosmology (FLASY2011)
• WIMP Dark Matter in the U$\mu \nu$SSM
• Right-handed sneutrino and gravitino multicomponent dark matter in light of neutrino detectors
• Fenomenología de modelos supersimétricos: partículas y materia oscura