Anomaly Induced Dark Matter Decay and PAMELA/ATIC Experiments

Understand

The cosmic ray data of PAMELA/ATIC may be explained by dark matter decay with a decay rate $\tau_{DM}^{-1}\sim 10^{-26}{sec}^{-1} \sim 10^{-45}{eV}$, an energy scale which could not be understood within the framework of the standard model or its simple supersymmetric extension.

• We propose anomaly induced dark matter decay to exponentially suppress the decay rate, and apply to a supersymmetric extension of the Ma's inert Higgs model of the radiative seesaw mechanism for neutrino masses.
• In this model the lightest right-handed neutrino $\psi_N$ and the lightest neutralino $\chi$ can fill the observed necessary dark matter relic, and we find that $\psi_N$ can decay into $\chi$ through anomaly with a right order of decay rate, emitting only leptons.
• All the emitted poistrons are right-handed.