Eur. Phys. J. A (2006) 28: 361-367
https://doi.org/10.1140/epja/i2006-10059-y

Hadron Physics

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

¹ Department of Physics, Peking University, 100871, Beijing, PRC
² China Center of Advanced Science and Technology (World Laboratory), 100080, Beijing, PRC

Received: 8 June 2006
Accepted: 10 June 2006
Published online: 21 July 2006

Abstract

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.