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In this note, we study the contributions from the S-wave resonances,f_{0}(980) and f_{0}(1500), to the B^{0}_{s}\rightarrow \psi(3770)\pi^{+}\pi^{-} decay by introducing the S-wave \pi\pi distribution amplitudeswithin the framework of the perturbative QCD approach. Both resonant andnonresonant contributions are contained in the scalar form factor in the S-wavedistribution amplitude \Phi^S_{\pi\pi}. Since the vector charmonium meson\psi(3770) is a S-D wave mixed state, we calculated the branching ratios ofS-wave and D-wave respectively, and the results indicate that f_{0}(980) is themain contribution of the considered decay, and the branching ratio of the\psi(2S) mode is in good agreement with the experimental data. We also take theS-D mixed effect into the B^{0}_{s}\rightarrow \psi(3686)\pi^ {+}\pi^{-} decay.Our calculations show that the branching ratio of B^{0}_{s}\rightarrow\psi(3770)(\psi(3686))\pi^ {+}\pi^{-} can be at the order of 10^{-5}, which canbe tested by the running LHC-b experiments.

Study of the quasi-two-body decays B^{0}_{s} \rightarrow \psi(3770)(\psi(3686))\pi^+\pi^- with perturbative QCD approach