Abstract
We consider a new scenario for supersymmetric decaying dark matter without R-parity violation in theories with goldstini, which arise if supersymmetry is broken independently by multiple sequestered sectors. The uneaten goldstino naturally has a long lifetime and decays into three-body final states including the gravitino, which escapes detection, and two visible particles. The goldstini low-energy effective interactions are derived, which can be non-universal and allow the dark matter to be leptophilic, in contrast to the case of a single sector supersymmetry breaking. In addition, the three-body decay with a missing particle gives a softer spectrum. Consequently, it is possible to fit both the e +/e − excess observed by the PAMELA and the e + + e − measurements by the Fermi-LAT using universal couplings to all three lepton flavors or 100% branching fraction into electrons/positrons, both of which are disfavored in the conventional scenario of dark matter decays into two or four visible particles without missing energy.
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Cheng, HC., Huang, WC., Low, I. et al. Goldstini as the decaying dark matter. J. High Energ. Phys. 2011, 19 (2011). https://doi.org/10.1007/JHEP03(2011)019
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DOI: https://doi.org/10.1007/JHEP03(2011)019