Non factorizable Effetcs in $B\to {\chi }_{c0}{K}^{-}$ from Charmed Meson Rescattering

Abstract

The $B^{-}\to {\chi }_{c0}{K}^{-}$ decay which has no visible factorizable amplitude, could be induced by the Cabibbo-allowed, color-favored $B^{-}\to D_s{D}^{\ast 0}$, $B^{-}\to D_s^{\ast 0}{D}^0$ and $B\to D_s^{\ast }{D}^{\ast }$ via the rescattering of these charmed mesons to ${\chi }_{co}{K}^{-}$. In this talk I would like to discuss a recent calculation \cite{Colangelo} of these effects for $B^{-}\to {\chi }_{c0}{K}^{-}$ and $B^{-}\to J/\psi K^{-}$ decays. We find that charmed scattering effects seem capable of producing a large $B^{-}\to {\chi }_{c0}{K}^{-}$ branching ratio measured by the Babar and Belle Collaboration and make a significant contribution to the $B^{-}\to J/\psi K^{-}$ branching ratios in agreement with experiments.

Comments: Talk at the International Workshop on QCD: QCD@Work 2003 - Conversano (Italy) 14-18 June 2003 (eConf C030614), 4 pages LaTeX, 3 eps figures, revised version, 1 reference added, text unchanged