The recently observed excess in gamma-ray signal near the Galactic center suggests that dark matter particles may annihilate into charged fermions that produce gamma-ray to be observed. In this paper, we consider a leptonic dark matter, which annihilates into the standard model leptons, μ+μ- and τ+τ-, by the interaction of the gauged lepton number U(1)Lμ-Lτ and fits the observed excess. Interestingly, the necessary annihilation cross section for the observed gamma-ray flux provides a good fit to the value for the relic abundance of dark matter. We identify the preferred parameter space of the model after taking the existing experimental constraints from the precision measurements including the muon (g-2), tau decay, neutrino trident production, dark matter direct detection, LHC, and LEP experiments.
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2016 Jan 10|
Bibliographical noteFunding Information:
J.C.P. and S.C.P. are supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (based on contract numbers NRF-2013R1A1A2061561 and 2013R1A1A2064120 , respectively).
© 2015 The Authors.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics