Heavy-to-heavy quark decays at NNLO
Abstract
Details of a recent calculation of O(alphas2) corrections to the decay b -> c,l,nul, taking into account the c-quark mass, are described. Construction of the expansion in the mass ratio mc/mb as well as the evaluation of new four-loop master integrals are presented. The same techniques are applicable to the muon decay, mu -> e,numu,anti-nue. Analytical results are presented, for the physical cases as well as for a model with purely-vector couplings.
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