Factorization and SU(2) Heavy Flavor Symmetry for B-Meson Decays Producing Charmonium

We show that the factorization assumption in color-suppressed $B$ meson decays is not ruled out by experimental data on $B \ra K(K^) + J/\Psi(\Psi^{'})$. The problem previously pointed out might be due to an inadequate choice of hadronic form factors. Within the Isgur-Wise SU(2) heavy flavor symmetry framework, we search for possible $q^2$ dependence of form factors that are capable of explaining simultaneously the large longitudinal polarization ${\rho }_L$ observed in $B\text{ra}{K}^{\ast }+J\mathrm{/}\mathrm{\Psi }$ and the relatively small ratio of rates $R_{J/\Psi} = \Gamma(B \ra K^ + J/\Psi)/\Gamma(B \ra K + J/\Psi)$\mathrm{.}Wefindoutthatthepuzzlecouldbeessentiallyunderstoodifthe$A_1(q^2)$ form factor is frankly decreasing, instead of being almost constant or increasing as commonly assumed. Of course, the possibility of understanding experimental data is not necessarily a proof of factorization.