Nambu-Goldstone Dark Matter and Cosmic Ray Electron and Positron Excess

TL;DR

This paper introduces a dark matter model as a pseudo-Nambu-Goldstone boson that explains cosmic ray electron and positron excesses through resonance-enhanced annihilation into light leptons, aligning with recent experimental observations.

Contribution

It presents a novel dark matter candidate within a supersymmetry framework that accounts for cosmic ray anomalies via resonance effects without requiring halo overdensities.

Findings

Explains electron and positron excesses via resonance-enhanced annihilation.

Evades anti-proton flux constraints naturally.

Aligns with recent cosmic ray experimental data.

Abstract

We propose a model of dark matter identified with a pseudo-Nambu-Goldstone boson in the dynamical supersymmetry breaking sector in a gauge mediation scenario. The dark matter particles annihilate via a below-threshold narrow resonance into a pair of R-axions each of which subsequently decays into a pair of light leptons. The Breit-Wigner enhancement explains the excess electron and positron fluxes reported in the recent cosmic ray experiments PAMELA, ATIC and PPB-BETS without postulating an overdensity in halo, and the limit on anti-proton flux from PAMELA is naturally evaded.