The large quark mass expansion of Λ( Z0 → hadrons) and Λ( τ− → vτ + hadrons)in the order αs3

We present the analytical α s 3 correction to the Z 0 decay rate into hadrons. We calculate this correction up to (and including) terms of the order ( m Z 2/ m top 2) 3 in the large top quark mass expansion. We rely on the technique of the large mass expansion of individual Feynman diagrams and trea...

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Bibliographic Details
Published in:Nuclear physics. B 1995-03, Vol.438 (1), p.278-304
Main Authors: Larin, S.A., van Ritbergen, T., Vermaseren, J.A.M.
Format: Article
Language:English
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Summary:We present the analytical α s 3 correction to the Z 0 decay rate into hadrons. We calculate this correction up to (and including) terms of the order ( m Z 2/ m top 2) 3 in the large top quark mass expansion. We rely on the technique of the large mass expansion of individual Feynman diagrams and treat its application in detail. We convert the obtained results of six-flavour QCD to the results in the effective theory with five active flavours, checking the decoupling relation of the QCD coupling constant. We also derive the large charm quark mass expansion of the semihadronic τ lepton decay rate in the α s 3 approximation.
ISSN:0550-3213
1873-1562
DOI:10.1016/0550-3213(94)00574-X