Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-07-10
JCAP 1010:033,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages,16 figures v2: one numerical error corrected, one figure added, main results unchanged
Scientific paper
10.1088/1475-7516/2010/10/033
It was recently pointed out that in supersymmetric scenarios with gravitino dark matter and bilinear R-parity violation, gravitinos with masses below Mw typically decay with a sizable branching ratio into the 3-body final states W^*+lepton and Z^*+neutrino. In this paper we study the indirect detection signatures of gravitino dark matter including such final states. First, we obtain the gamma ray spectrum from gravitino decays, which features a monochromatic contribution from the decay into photon+neutrino and a continuum contribution from the three-body decays. After studying its dependence on supersymmetric parameters, we compute the expected gamma ray fluxes and derive new constraints, from recent FERMI data, on the R-parity breaking parameter and on the gravitino lifetime. Indirect detection via antimatter searches, a new possibility brought about by the three-body final states, is also analyzed. For models compatible with the gamma ray observations, the positron signal is found to be negligible whereas the antiproton one can be significant.
Choi Ki-Young
Restrepo Diego
Yaguna Carlos E.
Zapata Oscar
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