Two-loop QCD Corrections to b c Transitions at Zero Recoil: Analytical Results
Andrzej Czarnecki, Kirill Melnikov
Abstract
We present analytical results for the O(αs 2) contributions to the functions ηA and ηV 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.
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