Title

On the cosmic-ray spectra of three-body lepton-flavor-violating dark matter decays

Document Type

Article

Department/Program

Physics

Journal Title

Physics Letters B

Pub Date

2011

Volume

704

Issue

5

First Page

541

Abstract

We consider possible leptonic three-body decays of spin-1/2, charge-asymmetric dark matter. Assuming a general Dirac structure for the four-ferrnion 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. (C) 2011 Elsevier B.V. All rights reserved.

DOI

10.1016/j.physletb.2011.09.086

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