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Exclusive Rare Decay B → K ∗ γ

We show that the exclusive decay B → K ∗ γ can be related to the semileptonic decay B → ρe ¯ ν using heavy-quark symmetry and SU (3) ﬂavor symmetry. A direct measurement of the q 2 -spectrum for the semileptonic decay can provide relevant information for the exclusive rare decay.