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We study long-distance effects in rare exclusive semileptonic decays B ->K_{1}ell ^{+}ell ^{-}, K_{1} is the axial vector meson.The form factors,describing the meson transition amplitudes of the effective Hamiltonian, arecalculated using Ward identites which are then used to calculate branchingratio and forward-backward asymmetry in these decay modes. The zero offorward-backward asymmetry is of special interest and provide us the precissiontest of Standard model.

Form factors, branching ratio and forward-backward asymmetry in B -> K_{1}ell ^{+} ell ^{-} decays