Four and Three Loop Calculations in QCD: Theory and Applications

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(alpha_s**3) gluino contribution to R(s) and its implications to the Z boson and tau-lepton decay rates.

Comments: 14 pages, LaTeX, 3 figures; epsfig.sty and subfig.sty are used. Invited talk at the Cracow International Symposium on Radiative Corrections 1-5 August 1996, Cracow, Poland