Supersymmetry and the positron excess in cosmic rays

Details Supersymmetry and the positron excess in cosmic rays Supersymmetry and the positron excess in cosmic rays

2001-08-16

arxiv.org/abs/hep-ph/0108138v2

Phys.Rev. D65 (2002) 057701

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, references added, minor wording changes

Scientific paper

10.1103/PhysRevD.65.057701

Recently the HEAT balloon experiment has confirmed an excess of high-energy positrons in cosmic rays. They could come from annihilation of dark matter in the galactic halo. We discuss expectations for the positron signal in cosmic rays from the lightest superpartner. The simplest interpretations are incompatible with the size and shape of the excess if the relic LSPs evolved from thermal equilbrium. Non-thermal histories can describe a sufficient positron rate. Reproducing the energy spectrum is more challenging, but perhaps possible. The resulting light superpartner spectrum is compatible with collider physics, the muon anomalous magnetic moment, Z-pole electroweak data, and other dark matter searches.

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