Towards Order alpha_s^4 Accuracy in tau-decays

J.H. K\"uhn; K.G. Chetyrkin; P.A. Baikov

Towards Order alpha_s^4 Accuracy in tau-decays

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arxiv hep-ph/0212299 v1 pith:TITHTDRC submitted 2002-12-19 hep-ph

P.A. Baikov , K.G. Chetyrkin , J.H. Kühn This is my paper · ORCID

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keywords alphatermsmassorderquarkstrangeaccuracyarrive

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Recently computed terms of orders O(\alpha_s^4 n_f^2) in the perturbative series for the tau decay rate, and similar (new) strange quark mass corrections, are used to discuss the validity of various optimization schemes. The results are then employed to arrive at improved predictions for the complete terms order O(\alpha_s^4) and O(\alpha_s^5) in the massless limit as well as for terms due to the strange quark mass. Phenomenological implications are presented.

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