Exclusive Rare Decay $B\rightarrow K^{\ast}\gamma$
  We show that the exclusive decay $B\rightarrow K^{\ast}\gamma$ can be related to the semileptonic decay $B\rightarrow\rho e\bar{\nu}$ 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. 
Patrick J. O'Donnell and Humphrey K.K. Tung