Towards Order alphas4 Accuracy in tau-decays
Abstract
Recently computed terms of orders O(αs4 nf2) 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(αs4) and O(αs5) in the massless limit as well as for terms due to the strange quark mass. Phenomenological implications are presented.
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