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

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

2008-11-04

arxiv.org/abs/0811.0477v2

Phys.Lett.B673:255-259,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

the version appeared in PLB

Scientific paper

10.1016/j.physletb.2009.02.046

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.

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