NEXT-TO-LEADING ORDER QCD CORRECTIONS TO DELTA-F=2 EFFECTIVE-HAMILTONIANS

The most general QCD next-to-leading anomalous-dimension matrix of all four-fermion dimension-six Delta F = 2 operators is computed. The res ults of this calculation can be used in many phenomenological applicat ions, among which the most important are those related to theoretical predictions of K-0-(K) over bar(0) and B-0-(B) over bar(0) mixing in s everal extensions of the Standard Model (supersymmetry, left-right sym metric models, multi-Higgs models, etc.), to estimates the B-s(0)-(B) over bar(s)(0) width difference, and to the calculation of the O(1/m(b )(3)) corrections for inclusive b-hadron decay rates. (C) 1998 Elsevie r Science B.V.