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We analyze the semileptonic $B \to a_1 \ell^+\ell^-$, $\ell=\tau, \mu, e$transitions in the frame work of the three-point QCD sum rules in the standardmodel. These rare decays governed by flavor-changing neutral current transitionof $b \to d$. Considering the quark condensate contributions, the relevant formfactors as well as the branching fractions of these transitions are calculated.

Form factors and branching ratios of the FCNC $B \to a_1 \ell^{+}\ell^{-}$ decays