Supersymmetry and the positron excess in cosmic rays

Abstract

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.

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

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• Supersymmetry and Cosmology
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• The DAMPE excess and gamma-ray constraints
• Dark Matter in the Singlet Extension of MSSM: Explanation of Pamela and Implication on Higgs Phenomenology
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• Higgsino dark matter model consistent with galactic cosmic ray data and possibility of discovery at LHC-7
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• Introduction to Non-Baryonic Dark Matter
• Suppression of the neutralino relic density with supersymmetric CP violation
• Dark matter in the MSSM and its singlet extension
• Dark Matter Constituents
• Connecting String/M Theory to the Electroweak Scale and to LHC Data