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2009

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

Ibe, Masahiro, Nakayama, Yu, Murayama, Hitoshi et al.

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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.

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

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2006
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M. Ibe and R. Kitano, Phys. Rev. D 75
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