Decaying Hidden Gauge Boson and the PAMELA and ATIC/PPB-BETS Anomalies

TL;DR

This paper proposes a model where a decaying hidden gauge boson explains cosmic ray anomalies observed by PAMELA and ATIC/PPB-BETS, aligning with experimental constraints and natural parameter hierarchies.

Contribution

It introduces a novel dark matter scenario involving a hidden U(1) gauge boson decaying via kinetic mixing with U(1)B-L, explaining multiple cosmic ray anomalies simultaneously.

Findings

The model accounts for PAMELA positron excess.

It explains ATIC/PPB-BETS electron/positron fluxes.

Antiproton flux is suppressed, consistent with observations.

Abstract

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(10^26) seconds.