Cosmic rays from Leptonic Dark Matter

Abstract

If dark matter possesses a lepton number, it is natural to expect the dark-matter annihilation and/or decay mainly produces the standard model leptons, while negligible amount of the antiproton is produced. To illustrate such a simple idea, we consider a scenario that a right-handed sneutrino dark matter decays into the standard model particles through tiny R-parity violating interactions. Interestingly enough, charged leptons as well as neutrinos are directly produced, and they can lead to a sharp peak in the predicted positron fraction. Moreover, the decay of the right-handed sneutrino also generates diffuse continuum gamma rays which may account for the excess observed by EGRET, while the primary antiproton flux can be suppressed. Those predictions on the cosmic-ray fluxes of the positrons, gamma rays and antiprotons will be tested by the PAMELA and FGST observatories.

21 pages, 4 figures, 2 tables, updated plots including PAMELA data

References in corpus (8)

• Phenomenology with Massive Neutrinos
• Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
• Inflaton Decay in Supergravity
• Gamma Ray Spectrum from Gravitino Dark Matter Decay
• Gamma rays and positrons from a decaying hidden gauge boson
• Anomaly-Induced Inflaton Decay and Gravitino-Overproduction Problem
• Right-Handed Sneutrino as Cold Dark Matter of the Universe
• Revival of the Thermal Sneutrino Dark Matter

Cited by in corpus (10)

• The PAMELA and ATIC Excesses From a Nearby Clump of Neutralino Dark Matter
• Discriminating different scenarios to account for the cosmic $e^{\pm }$ excess by synchrotron and inverse Compton radiation
• Cosmic Rays from Leptophilic Dark Matter Decay via Kinetic Mixing
• R-violating Decay of Wino Dark Matter and electron/positron Excesses in the PAMELA/Fermi Experiments
• Extended MSSM Neutralinos as the Source of the PAMELA Positron Excess
• Neutralino Dark Matter with Inert Higgsinos and Singlinos
• Sneutrino Dark Matter and the Observed Anomalies in Cosmic Rays
• R-parity preserving super-WIMP decays
• ATIC/PAMELA anomaly from fermionic decaying Dark Matter
• Decaying neutralino dark matter in anomalous $U(1{)}_H$ models