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If interpreted in terms of decaying dark matter, the steep rise in thepositron fraction of cosmic rays above 10 GeV, as observed by the PAMELAexperiment, suggests an underlying production mechanism that favors leptonicchannels. We consider a scenario where a portion of the dark matter is made ofthe gauginos of an unbroken hidden-sector U(1), which interact with the visiblesector only through a tiny kinetic mixing. The second component of the darkmatter is made of neutralinos, and depending on the mass spectrum, the lightestneutralino or the hidden gaugino becomes unstable and subject to decay. Weanalyze the cosmic rays, namely the contributions to the positron, theextragalactic gamma-ray and the antiproton flux, which potentially result fromthese decays and demonstrate that the production of antiprotons can benaturally suppressed. Furthermore, we briefly discuss the apparent double-peakstructure of the ATIC data in light of cascade-decaying hidden gauginos, aswell as possible signatures at Fermi.

Cosmic Rays from Leptophilic Dark Matter Decay via Kinetic Mixing