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

Abstract

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.

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

References in corpus (12)

• PYTHIA 6.4 Physics and Manual
• Observation of an anomalous positron abundance in the cosmic radiation
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• Asymmetric Dark Matter
• On possible interpretations of the high energy electron-positron spectrum measured by the Fermi Large Area Telescope
• Asymmetric Dark Matter from Leptogenesis
• Decaying Dark Matter can explain the electron/positron excesses
• Darkogenesis
• Antimatter Signatures of Gravitino Dark Matter Decay
• $e^{\pm }$ Excesses in the Cosmic Ray Spectrum and Possible Interpretations
• Goldstini as the decaying dark matter
• Cosmic Sum Rules

Cited by in corpus (9)

• Lepton-Flavored Dark Matter
• Simplified TeV leptophilic dark matter in light of DAMPE data
• AMS-02 Positron Excess and Indirect Detection of Three-body Decaying Dark Matter
• Lepton Flavor Violation Induced by Dark Matter
• Hints of a Charge Asymmetry in the Electron and Positron Cosmic-Ray Excesses
• The case for three-body decaying dark matter
• Pseudo-Familon Dark Matter
• An Interpretation of the Cosmic Ray $e^{+}+e^{-}$ Spectrum from 10 GeV to 3 TeV Measured by CALET on the ISS
• Triplet Dark Matter from leptogenesis