Two-loop QCD Corrections to b to c Transitions at Zero Recoil: Analytical Results
classification
✦ hep-ph
keywords
resultsanalyticalcorrectionsrecoiltransitionstwo-loopzeroalpha
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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 $b \to c$ 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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