S -wave K π contributions to the hadronic charmonium B decays in the perturbative QCD approach

We extend our recent works on the two-pion S-wave resonance contributions to the kaon-pion ones in the B meson hadronic charmonium decay modes based on the perturbative QCD approach. The S-wave Kπ timelike form factor in its distribution amplitudes is described by the LASS parametrization, which consists of the K0*(1430) resonant state together with an effective range nonresonant component. The predictions for the decays B→J/ψKπ in this work agree well with the experimental results from the BABAR and Belle collaborations. We also discuss theoretical uncertainties, indicating that the results of this work, which can be tested by the LHCb and Belle-II experiments, are reasonably accurate.