B→Xsγ constraints on the top quark anomalous t→cγ coupling

Observation of the top quark flavor changing neutral process t→c+γ at the LHC would be the signal of physics beyond the standard model. If anomalous t→cγ coupling exists, it will affect the precisely measured B(B→Xsγ). In this paper, we study the effects of a dimension 5 anomalous tcγ operator in B→Xsγ decay to derive constraints on its possible strength. It is found that, for real anomalous t→cγ coupling κtcRγ, the constraints correspond to the upper bounds B(t→c+γ)<6.54x10-5 (for κtcRγ>0) and B(t→c+γ)<8.52x10-5 (for κtcRγ<0), respectively, which are about the same order as the 5σ discovery potential of ATLAS (9.4x10-5) and slightly lower than that of CMS (4.1x10-4) with 10 fb-1 integrated luminosity operating at √(s)=14 TeV.