Bu→ψM decays and S-D wave mixing effects

The Bu→ψM decays are studied with the perturbative QCD approach, where the psion ψ = ψ(2S),ψ(3770), ψ(4040) and ψ(4160), and the light meson M = π, K, ρ and K*. The factorizable and non-factorizable contributions, and the S-D wave mixing effects on the psions, are considered in the calculation. With appropriate inputs, the branching ratios for the Bu→ψK decays are generally coincident with the experimental data within errors. However, due to the large theoretical and experimental errors, it is impossible for the moment to give a severe constraint on the S-D wave mixing angles.