Abstract
簡略We study the branching ratios of the exclusive decays of$B\toK^{(*)}\nu\bar\nu$ and $B\to K^{(*)}\ell^+\ell^-$in various formfactors models. We investigate the longitudinal,transverse andnormal lepton polarization asymmetries in theexclusive processesof $B\to K\ell^+\ell^-$ and $B\to K^*\ell^+\ell^-$. The T-oddobservables arising fromthe two-spin correlation of lepton pairare also evaluated.We include both short and long-distancecontributions to theasymmetries in our discussions. It is foundthat the absorptivepart of the penguin diagram plays animportant role in the T-odd quantities. However, theseestimations are model dependent.