On the Cosmic-Ray Spectra of Three-Body Lepton-Flavor-Violating Dark Matter Decays

Details On the Cosmic-Ray Spectra of Three-Body Lepton-Flavor-Violating Dark Matter Decays On the Cosmic-Ray Spectra of Three-Body Lepton-Flavor-Violating Dark Matter Decays

2011-08-10

arxiv.org/abs/1108.2084v3

Physics Letters B 704 (2011), pp. 541-546

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages LaTeX, 3 figures (8 eps files). v2 and v3: clarifications and references added

Scientific paper

We consider possible leptonic three-body decays of spin-1/2, charge-asymmetric dark matter. Assuming a general Dirac structure for the four-fermion contact interactions of interest, we study the cosmic-ray electron and positron spectra and show that good fits to the current data can be obtained for both charged-lepton-flavor-conserving and flavor-violating decay channels. We find that different choices for the Dirac structure of the underlying decay operator can be significantly compensated by different choices for the dark matter mass and lifetime. The decay modes we consider provide differing predictions for the cosmic-ray positron fraction at energies higher than those currently probed at the PAMELA experiment; these predictions might be tested at cosmic-ray detectors like AMS-02.

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