Dark matter and muon (g-2) in local U(1)Lμ-Lτ -extended Ma model

We consider right-handed neutrino dark matter N-1 in local U(1)L mu-L tau -extended Ma model. With the light U(1)(mu-tau) gauge boson (m(Z') similar to O(100) MeV) and small U(1)(mu-tau) gauge coupling (g(Z') similar to 10(-4)-10(-3)) which can accommodate the muon (g-2) anomaly and is still allowed by other experimental constraints, we show that we can get correct relic density of dark matter for wide range of dark matter mass (M-1 similar to 10-200 GeV), although the gauge coupling constant g(Z') is small. This is due to the fact that the annihilation cross section of dark matter pair is enhanced by M-1(4)/m(Z')(4) in the processes N1N1 -> Z'Z' or N1N1 -> Z'H-2. We also consider the constraints from direct detection, collider searches. (C) 2016 The Author. Published by Elsevier B.V.