Unparticle effects in raret→cggdecay

Abstract

In this work the flavor-changing, rare $t\ensuremath{\rightarrow}cgg$ decay induced by mediation of scalar and tensor unparticles is studied. Using the standard model result for the branching ratio of the $t\ensuremath{\rightarrow}cgg$ decay, the parameter space of ${d}_{\mathcal{U}}$ and ${\ensuremath{\Lambda}}_{\mathcal{U}}$, where the branching ratio of this decay exceeds the one predicted by the standard model, is obtained. Measurement of the branching ratio larger than ${10}^{\ensuremath{-}9}$ can give valuable information for establishing unparticle physics.