%0 Journal Article %T A lattice calculation of the branching ratio for $\overline{B} \rightarrow K^* ¦Ã$ %A Hugh Shanahan %A UKQCD Collaboration %J Physics %D 1993 %I arXiv %X Preliminary results are presented on the calculation of the relevant form factor for the radiative decay $\overline{B} \rightarrow K^* \gamma$ We find that the form factor is weakly dependent on the spectator quark mass. We compare the results obtained for a full chiral extrapolation and where this independence is assumed. Both results are found to be statistically consistent with the experimental data. %U http://arxiv.org/abs/hep-lat/9311039v1