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Four and Three Loop Calculations in QCD: Theory and Applications

K. G. Chetyrkin

hep-pharXiv:hep-ph/9610531

Abstract

The talk briefly reviews the current state of the art in doing multiloop QCD calculations in a completely analytic way. In particular, we discuss recent analytical calculation of 4-loop O(alphas**3) gluino contribution to R(s) and its implications to the Z boson and tau-lepton decay rates.

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