The semileptonic decays of Bc(2S)

The [Formula: see text] meson cannot decay through the OZI-allowed channels because its mass is below the BD threshold. The [Formula: see text] meson also cannot decay to multi-light hadron states, since there is different quark in [Formula: see text] meson. The decay modes of [Formula: see text] include the strong decay [Formula: see text], a few electromagnetic decays and many more weak decay channels. So the electromagnetic decays of [Formula: see text] have been discussed in the previous work. In this letter, we study the semileptonic weak decays of [Formula: see text] meson. The mass and wave functions of [Formula: see text] meson are calculated by the improved Bethe–Salpeter(BS) method. According to the BS wave functions of [Formula: see text] and final-state mesons, we get the hadronic matrix element, then the semileptonic decay channels of [Formula: see text] to final-state mesons as pseudoscalar mesons and vector mesons are studied. Finally, the semileptonic weak decay widths of [Formula: see text] are presented.