TWO-LOOP QCD CORRECTIONS TO B-]C TRANSITIONS AT ZERO RECOIL - ANALYTICAL RESULTS

摘要

We present analytical results for the O(alpha(s)(2)) contributions to the functions eta A and eta V which parameterize QCD corrections to semileptonic b --> c transitions at zero recoil. Previously obtained approximate results are confirmed. The methods of computing the relevant two-loop diagrams with two mass scales are discussed in some detail. (C) 1997 Elsevier Science B.V. [References: 18]