Abstract
Forward-backward charge asymmetry in rare dilepton B-decays is formulated with the assumption of an on-shell b-quark. We find that the asymmetry is expressed in terms of two spatially transverse helicity amplitudes, which are determined by combining the data of D → K ∗ (892) l +ν with heavy flavour symmetry. We estimate the charge asymmetry of B → K ∗ (892) l +l − for large energy leptons against various top masses in the standard model.
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