Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-08-27
Phys.Lett.B695:476-481,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 2 tables, 1 figure
Scientific paper
10.1016/j.physletb.2010.11.063
The positron anomaly recently reported by the cosmic-ray measurements can be explained by the decaying dark matter scenario, where it decays mainly into leptons with the lifetime of O(10^26) second. When the dark matter is a fermionic particle, the lifetime of this order is known to be obtained by a dimension 6 operator suppressed by the unification scale 10^16 GeV, while such decay operators do not necessarily involve only leptons. In addition, the scenario would be spoiled if there exist lower-dimensional operators inducing the dark matter decay. We show in this letter that a single non-Abelian discrete symmetry such as A_4 is possible to prohibit all such harmful (non-leptonically coupled and lower-dimensional) operators. Moreover, the dark matter decays into charged leptons in a flavor-blind fashion due to the non-Abelian flavor symmetry, which results in perfect agreements not only with the PAMELA data but also with the latest Fermi-LAT data reported very recently. We also discuss some relevance between the discrete symmetry and neutrino physics.
Haba Naoyuki
Kajiyama Yuji
Matsumoto Shigeki
Okada Hiroshi
Yoshioka Koichi
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