Nonfactorization and Color-Suppressed $B\to \psi (\psi (2S))+K(K^{\ast })$ Decays

Using $N_c=3$ value of the parameter $a_2=0.09$ but including a modest nonfactorized amplitude, we show that it is possible to understand all data, including polarization, for color-suppressed $B\to \psi (\psi (2S))+K(K^{\ast })$ decays in all commonly used models of form factors. We show that for $B\to\psi +K$decayonecandefineaneffective$ a_2$, which is process-dependent and, in general, complex; but it is not possible to define an effective $a_2$ for $B\to \psi +K^{\ast }$ decay. We also explain why nonfactorized amplitudes do not play a significant role in color-favored B decays.