The S-wave resonance contributions in the $B_s^0$ decays into $\psi (2S,3S)$ plus pion pair

Zhou Rui, Ya Li, Wen-Fei Wang

The three-body decays $B_s^0\to \psi (2S,3S){\pi }^{+}{\pi }^{-}$ are studied based on the perturbative QCD approach. With the help of the nonperturbative two-pion distribution amplitudes…