Signatures of complex new physics in b → c τ ν ˉ transitions

摘要

The anomalies in the measurements ofRDandRD?continue to provide motivation for physics beyond the Standard Model. In this work, we assume the new physics Wilson coefficients to be complex and find their values by doing a global fit to the presentb→cτνˉdata. We find that the number of allowed solutions depend on the choice of the upper limit onBr(Bc→τνˉ). We find that the forward-backward asymmetries inB→(D,D?)τνˉdecays have the capability to distinguish between different solutions. Further we calculate the maximum values of CP violating triple product asymmetries inB→D?τνˉdecay allowed by the current data. We observe that only one of the three CP asymmetries can be enhanced up to a maximum value of～2?3%whereas the other asymmetries remain smaller.