EFFECTIVE LAGRANGIAN FOR B[-S PROCESSES WITH QCD-CORRECTIONS

We present a complete calculation of the effective Lagrangian for b --> s processes with QCD corrections, in the leading logarithm approximation, for the cases m(t) = M(w) and m(t) much greater than m(w). The effective Lagrangian is then applied to estimate the b --> sgamma decay rate. We find that it is enhanced by a factor of 6 for the case m(t) = m(w), and a factor of about 2 for m(t) much greater than m(w). Our results differ from those found in the literature, but are not very different numerically. Also from our results, we infer that the higher-dimensional QCD effects are under control to about 15% level for the Wilson coefficients.