  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.
