Rare Decay Z -> nu(nu)over-bar gamma gamma via Tensor Unparticle Mediation

The decay width of the rare decay Z -> nu(nu) over bar gamma gamma is strictly constrained from the LEP data. Tensor unparticles provide a tree-level contribution to this rare decay. We have calculated the tensor unparticle contribution to the rare decay Z -> nu(nu) over bar gamma gamma. The current experimental limit has been used to constrain the unparticle couplings nu(nu) over bar Zu(mu nu) and gamma gamma u(mu nu).