Dark Matter through the Axion Portal

Details Dark Matter through the Axion Portal Dark Matter through the Axion Portal

2008-10-30

arxiv.org/abs/0810.5397v2

Phys.Rev.D79:075008,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages; reference added

Scientific paper

10.1103/PhysRevD.79.075008

Motivated by the galactic positron excess seen by PAMELA and ATIC/PPB-BETS, we propose that dark matter is a TeV-scale particle that annihilates into a pseudoscalar "axion." The positron excess and the absence of an anti-proton or gamma ray excess constrain the axion mass and branching ratios. In the simplest realization, the axion is associated with a Peccei-Quinn symmetry, in which case it has a mass around 360-800 MeV and decays into muons. We present a simple and predictive supersymmetric model implementing this scenario, where both the Higgsino and dark matter obtain masses from the same source of TeV-scale spontaneous symmetry breaking.

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