ψ(3770) and B meson exclusive decay B → ψ(3770)K in QCD factorization
Department of Physics, Peking University, 100871, Beijing, PRC
2 China Center of Advanced Science and Technology (World Laboratory), 100080, Beijing, PRC
Accepted: 10 June 2006
Published online: 21 July 2006
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.
PACS: 13.25.Hw Decays of bottom mesons – / 12.38.Bx Perturbative calculations – / 14.40.Gx Mesons with S = C = B = 0, mass > 2.5G eV (including quarkonia) –
© Società Italiana di Fisica and Springer-Verlag, 2006