ψ(3770) and B meson exclusive decay B → ψ(3770)K in QCD factorization.

Belle has observed surprisingly copious production of ψ(3770) in the B meson decay B → ψ(3770) K, whose rate is comparable to that of B → ψ(3686) K. We study this puzzling process in the QCD factorization approach with the effect of the S- D mixing considered. We find that the soft scattering effects in the spectator interactions play an essential role. With a proper parametrization for the higher-twist soft end-point singularities associated with kaon, and with the S- D mixing angle θ = - 12°, the calculated decay rates can be close to the data. Implications of these soft spectator effects to other charmonium production in B exclusive decays are also emphasized. [ABSTRACT FROM AUTHOR]