Heavy Quark Vacuum Polarisation to Three Loops

preprint1995arXivOpen access

Abstract

The real and imaginary part of the vacuum polarisation function Π(q2)Π(q^2) induced by a massive quark is calculated in perturbative QCD up to order αs2α_s^2. The method is described and the results are presented. This extends the calculation by Källén and Sabry from two to three loops.

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