QCD Corrections to Hadronic Z and tau Decays

P. A. Baikov, K. G. Chetyrkin, J. H. Kuehn

We present a brief (mainly bibliographical) report on recently performed calculations of terms of order O(α_s^4 n_f^2) and O(α_s^4 n_f^2 m_q^2) for hadronic Z and τdecay rates. A f…