Anomaly Induced Dark Matter Decay and PAMELA/ATIC Experiments

TL;DR

This paper proposes a novel anomaly-induced decay mechanism for dark matter within a supersymmetric model, explaining cosmic ray anomalies observed by PAMELA/ATIC with decay rates consistent with experimental data.

Contribution

It introduces a new anomaly-induced decay process for dark matter in a supersymmetric framework, addressing the cosmic ray excesses and explaining the decay rate scale.

Findings

Dark matter decay rate matches PAMELA/ATIC data

Lightest right-handed neutrino and neutralino can account for dark matter

Decay produces only leptons, consistent with observations

Abstract

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.