Phenomenology of $U(1{)}_{L_{\hat{I}}¼-L_{\ddot{I}}„}$ 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 $U(1{)}_{L_{\hat{I}}¼-L_{\ddot{I}}„}$ group, with a new Dirac fermion charged under this U(1) as a dark matter. We study the muon $(g-2{)}_{\hat{I}}¼$, 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.

18 pages, 5 figures; minor changes