Probing new physics in B→K(*) ℓ⁺ℓ^- decays

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.