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We derive a condition the short distance coefficients governing $b\to(s,d)\ell^+\ell^-$ transitions must satisfy in order for the forward-backwardasymmetry to vanish in the exclusive modes $B\to (K^*,\rho)\ell^+\ell^-$. Thisrelation, which is satisfied in the standard model, involves the coefficiententering in $b\to s\gamma$ transitions as well as one of the additional Wilsoncoefficients present in the leptonic modes. We show that the resulting relationis largely free of hadronic uncertainties, thus constituting a reliable test ofthe standard model in exclusive rare B decays.Comment: 10 pages, LaTeX, 1 postscript figur

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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Short distance coefficients and the vanishing of the lepton asymmetry inB→Vl+l−