We show that the PAMELA anomaly in the positron fraction as well as the ATIC/PPB-BETS excesses in the e− + e+ flux are simultaneously explained in our scenario that a hidden U(1)H gauge boson constitutes dark matter of the Universe and decays into the standard-model particles through a kinetic mixing with an U(1)B−L gauge boson. Interestingly, the B−L charge assignment suppresses an antiproton flux in consistent with the PAMELA and BESS experiments, while the hierarchy between the B−L symmetry breaking scale and the weak scale naturally leads to the right lifetime of O(1026) seconds.
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A 2009 study studied this question.