NEXT-TO-LEADING QCD CORRECTIONS TO B-]X-S-GAMMA IN SUPERSYMMETRY

We compute the QCD next-to-leading order matching conditions of the (c hromo)-magnetic operators relevant for B --> X(s)gamma in supersymmetr ic models with minimal flavour violation. The calculation is performed under the assumption that the charginos and one stop are lighter than all other squarks and the gluino, In the parameter region where a lig ht charged Higgs boson is consistent with measurements of BR(B --> X(s )gamma), we find sizeable corrections to the Wilson coefficients. As a consequence, there is a significant reduction of the stop-chargino ma ss region where the supersymmetric contribution has a large destructiv e interference with the charged-Higgs boson contribution. (C) 1998 Els evier Science B.V.