With the potential prospects of the at high‐luminosity heavy‐flavor experiments in the future, we investigated the CKM‐favored and tree‐dominated leptonic and semileptonic weak decays in the standard model (SM). The theoretical predictions and some discussions for the observable quantities including the total width of mesons, the branching fractions of leptonic and semileptonic weak decays, the lepton spin asymmetry, and forward–backward asymmetry are presented. Numerically, the weak decays of and have relatively large branching fractions of the order and , respectively, which are expected to be observed in future experiments.
Wang et al. (Thu,) studied this question.