PAMELA/ATIC Anomaly from Exotic Mediated Dark Matter Decay

Understand

We discuss dark matter decay mediated by exotically charged particles ("exotics") in a supersymmetric model with two dark matter (DM) components: One is the (bino-like) lightest supersymmetric particle (LSP) \chi, and the other is a newly introduced meta-stable neutral singlet $N$.

• $N$ decays to \chi e^+e^- via a dimension 6 operator induced by a penguin-type one loop diagram with the life time of 10^{26} sec., explaining energetic cosmic e^\pm excess observed recently by PAMELA and ATIC/PPB-BETS.
• The superheavy masses of exotics (\sim 10^{15-16} GeV) are responsible for the longevity of $N$.
• The superpartner of $N$ develops the vacuum expectation value (VEV) of order TeV so that the DM $N$ achieves the desired mass of 2 TeV.