We discuss in detail the calculation of the leading order QCD corrections to
the Effective Hamiltonian which governs bβsΞ³ and bβsg transitions in three different regularization schemes (HV,
NDR and DRED). We show that intermediate stages of the calculation do depend on
the regularization, but the same scheme independent coefficients can be
obtained in all the considered schemes. A detailed discussion of the results
already present in the literature is also given.Comment: 35 pp + 4 figs not included (available by anonymous ftp at
amisan.iss.infn.it (141.108.15.215), directory /ftp/dred ), LaTeX, ROME
973/93, INFN-ISS 93/6, ULB-TH 15/9