Towards Order alpha_s^4 Accuracy in tau-decays

Details Towards Order alpha_s^4 Accuracy in tau-decays Towards Order alpha_s^4 Accuracy in tau-decays

2002-12-19

arxiv.org/abs/hep-ph/0212299v1

Phys.Rev.D67:074026,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, REVTeX4. The complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/

Scientific paper

10.1103/PhysRevD.67.074026

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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