Phenomenology of $U(1{)}_{L_{\mu }-L_{\tau }}$ charged dark matter at PAMELA/FERMI and colliders

Abstract

Recent data on $e^{+}/e^{-}$ and $\bar{p}$ cosmic rays suggest that dark matter annihilate into the standard model (SM) particles through new leptophilic interaction. In this paper, we consider a standard model extension with the gauged $U(1{)}_{L_{\mu }-L_{\tau }}$ group, with a new Dirac fermion charged under this U(1) as a dark matter. We study the muon $(g-2{)}_{\mu }$, thermal relic density of the cold dark matter, and the collider signatures of this model. $Z^{{}^{\prime }}$ productions at the Tevatron or the LHC could be easily order of $O(1)-O(10^3)$ fb.

Comments: 18 pages, 5 figures; minor changes