Practicalities of renormalizing quantum field theories

Physics – High Energy Physics – High Energy Physics - Theory

Scientific paper

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24 latex pages, talk presented at Renormalization and Universality in Mathematical Physics Workshop, Toronto, 18-22 Oct, 2005

Scientific paper

We review the techniques used to renormalize quantum field theories at several loop orders. This includes the techniques to systematically extract the infinities in a Feynman integral and the implementation of the algorithm within computer algebra. To illustrate the method we discuss the renormalization of phi^4 theory and QCD including the application of the critical point large $N$ technique as a check on the anomalous dimensions. The renormalization of non-local operators in QCD is also discussed including the derivation of the two loop correction to the Gribov mass gap equation in the Landau gauge.

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