Abstract
We study the exclusive decays of B→K(*) ℓ + ℓ - by results in perturbative QCD with the heavy quark effective theory and lattice calculations. We obtain the form factors for the B→K(*) transitions in the whole allowed region. Our predictions for the branching ratios of B→K ℓ + ℓ - ; B→K(*) e + e - and B→K* μ + μ - are 0.53±0.05 -0.07 +0.10 , 1.68±0.17 -0.09 +0.14 and 1.34±0.13 -0.06 +0.11 × 10 -6 , where the errors are from the quark mixing elements and hadronic effects, respectively. We also find that our definitions of the T-odd observable and the up-down asymmetry of the K meson in B→K* ℓ + ℓ - → K πℓ + ℓ - can be used to probe new physics. © 2002 The American Physical Society.