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

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.

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References in corpus (9)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Observation of an anomalous positron abundance in the cosmic radiation
• Astrophysical Signatures of Secluded Dark Matter
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• PAMELA Positron Excess as a Signal from the Hidden Sector
• Gauge Mediation in Metastable Vacua
• Search for Light CP-odd Higgs in Radiative Decays of Upsilon(1S)
• Gauge mediation in supergravity and gravitino dark matter
• R-axion detection at LHC

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