Speaker
Mr
Satoshi Tsuchida
(Ritsumeikan University)
Description
The lightest Kaluza-Klein particle (LKP), which appears in the theory of universal extra dimensions, is one of the good candidates for cold dark matter. We assume the LKP mass ranges from 500 GeV to 1000 GeV. We focus on the LKP annihilation modes which contain gamma-rays as final products. The gamma-ray spectrum from LKP annihilation has a characteristic peak structure near the LKP mass (``lines'') from two-body decays and continuum emission. Gamma rays do not lose energy during propagation after production near the galactic center where dark matter concentration is expected, so we can treat it easier than electron.
We investigate the detectability of this peak structure by considering energy resolution of near-future detector, and calculate the expected count spectrum of the gamma-ray signal. The observed gamma-ray spectrum will show the peak clearly, if the LKP mass is heavier. In contrast, if the LKP mass is light, constraint for the boost factor becomes strictly. Detecting such peak structure would be conclusive evidence that dark matter is made of LKP.
| Registration number following "ICRC2015-I/" | 480 |
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Author
Mr
Satoshi Tsuchida
(Ritsumeikan University)
Co-author
Prof.
Masaki Mori
(Ritsumeikan University)
