The anomalies observed in recent cosmic ray experiments seem to strongly constrain the nature of the dark matter. In this letter, we investigate a possibility of the fermionic dark matter with a minimal extension of the standard model. We found that the dark matter decays caused by the dimension six operators can naturally explain the anomalies.
@article{arxiv.0812.2374,
title = {Cosmic Ray Positron and Electron Excess from Hidden-Fermion Dark Matter Decays},
author = {Koichi Hamaguchi and Satoshi Shirai and T. T. Yanagida},
journal= {arXiv preprint arXiv:0812.2374},
year = {2010}
}