Analysis of charge asymmetry in rare dileptonBdecays

We analyze the forward-backward charge asymmetry of lepton production in the rare decays B→${\mathit{X}}_{\mathit{s}}$ ${\mathit{l}}^{+}$ ${\mathit{l}}^{\mathrm{-}}$ and B→${\mathit{K}}^{\mathrm{*}}$ ${\mathit{l}}^{+}$ ${\mathit{l}}^{\mathrm{-}}$, including vector-resonance effects. Certain regions of phase space, in which the asymmetry is sensitive to individual short-distance coefficients, are pointed out. In particular, we suggest a method to test the coupling of the leptonic axial vector current to the left-handed quark current experimentally.