Unparticle effects on top quark rare decays

In this work we study the flavor changing neutral current (FCNC) decays of the top quark, t→cγt→cγ and t→cgt→cg, in the framework of the unparticle physics. The Standard Model predictions for the branching ratios of these decays are about ∼5×10−14∼5×10−14, and ∼1×10−12∼1×10−12, respectively. The parameter space of λ, Λ, and d   is obtained by taking into account the SM predictions and the results of the simulation performed by the ATLAS Collaboration for the branching ratios of t→cγt→cγ and t→cgt→cg decays.