Revisiting discrete dark matter model: θ 13 â 0 and ν R dark matter
Yuta Hamada (Department of Physics, Kyoto University, Kyoto, 606-8502, Japan); Tatsuo Kobayashi (Department of Physics, Hokkaido University, Sapporo, 060-0810, Japan, Department of Physics, Kyoto University, Kyoto, 606-8502, Japan); Atsushi Ogasahara (Department of Physics, Kyoto University, Kyoto, 606-8502, Japan); Yuji Omura (Department of Physics, Nagoya University, Nagoya, 464-8602, Japan); Fumihiro Takayama (Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto, 606-8502, Japan); et al - Show all 6 authors
We revisit the discrete dark matter model with the A 4 flavor symmetry originally introduced by M.Hirsch et.al . We show that radiative corrections can lead to non-zero θ 13 and the non-zero mass for the lightest neutrino. We find an interesting relation among neutrino mixing parameters and it indicates the sizable deviation of s 23 from the maximal angle s 23 2 = 1/2 and the degenerate mass spectrum for neutrinos. Also we study the possibilities that the right-handed neutrino is a dark matter candidate. Assuming that the thermal freeze-out explains observed dark matter abundance, TeV-scale right-handed neutrino and flavored scalar bosons are required. In such a case, the flavor symmetry plays an important role for the suppression of lepton flavor violating processes as well as for the stability of dark matter. We show that this scenario is viable within currently existing constraints from collider, low energy experiments and cosmological observations.
