HYBRID RENORMALIZATION OF PENGUINS AND DIMENSION-5 HEAVY-LIGHT OPERATORS

We discuss the renormalization of local, scalar and pseudoscalar dimen sion-5 operators containing a heavy and a light quark field at scales below the heavy-quark mass, using the formalism of the heavy-quark eff ective theory (HQET). We calculate the anomalous dimensions of these o perators and their mixing to one-loop order. We also perform the one-l oop matching of gluon and photon penguin operators onto operators of t he HQET. We discuss applications of our results to the mixing of gluon and photon penguin operators at low renormalization scales, and to th e calculation of 1/m(Q)(2) corrections to meson decays constants. (C) 1997 Elsevier Science B.V.