Nambu-Goldstone Dark Matter and Cosmic Ray Electron and Positron Excess
High Energy Physics - Phenomenology
2010-05-12 v1 Astrophysics of Galaxies
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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Cite
@article{arxiv.0902.2914,
title = {Nambu-Goldstone Dark Matter and Cosmic Ray Electron and Positron Excess},
author = {Masahiro Ibe and Yu Nakayama and Hitoshi Murayama and Tsutomu T. Yanagida},
journal= {arXiv preprint arXiv:0902.2914},
year = {2010}
}
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3 figures