High-energy Cosmic-Ray Positrons from Hidden-Gauge-Boson Dark Matter

Abstract

We provide a scenario in which a hidden U(1) 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, our model can naturally account for the steep rise in the positron fraction recently reported by PAMELA. Moreover, we find that due to the charge assignment of $U(1{)}_{B-L}$, only a small amount of antiprotons are produced in the decay, which is also consistent with the PAMELA and other observational data.

the version appeared in PLB

References in corpus (4)

• Secluded WIMP Dark Matter
• Inflaton Decay in Supergravity
• Gamma Ray Spectrum from Gravitino Dark Matter Decay
• Anomaly-Induced Inflaton Decay and Gravitino-Overproduction Problem

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• R-violating Decay of Wino Dark Matter and electron/positron Excesses in the PAMELA/Fermi Experiments
• ATIC and PAMELA Results on Cosmic e^\pm Excesses and Neutrino Masses
• Type II Seesaw and the PAMELA/ATIC Signals
• Cosmic Ray Positrons from Annihilations into a New, Heavy Lepton
• Decaying neutralino dark matter in anomalous $U(1{)}_H$ models