Two-loop QCD Corrections to $b \to c$ Transitions at Zero Recoil: Analytical Results

Details Two-loop QCD Corrections to $b \to c$ Transitions at Zero Recoil: Analytical Results Two-loop QCD Corrections to $b \to c$ Transitions at Zero Recoil: Analytical Results

1997-03-09

arxiv.org/abs/hep-ph/9703277v2

Nucl.Phys.B505:65-83,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, latex

Scientific paper

10.1016/S0550-3213(97)00500-2

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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