Gauge Invariance of Resummation Schemes: The QCD Partition Function

Details Gauge Invariance of Resummation Schemes: The QCD Partition Function Gauge Invariance of Resummation Schemes: The QCD Partition Function

1996-12-03

arxiv.org/abs/hep-th/9612033v2

Annals Phys.261:1-36,1997

Physics

High Energy Physics

High Energy Physics - Theory

29 pages, LaTeX, using RevTeX and feynmf.sty, Replacement: NO changes to the paper, TeX-source now additionally avaible

Scientific paper

10.1006/aphy.1997.5730

We pick up a method originally developed by Cheng and Tsai for vacuum perturbation theory which allows to test the consistency of different sets of Feynman rules on a purely diagrammatic level, making explicit loop calculations superfluous. We generalize it to perturbative calculations in thermal field theory and we show that it can be adapted to check the gauge invariance of physical quantities calculated in improved perturbation schemes. Specifically, we extend this diagrammatic technique to a simple resummation scheme in imaginary time perturbation theory. As an application, we check up to O(g^4) in general covariant gauge the gauge invariance of the result for the QCD partition function which was recently obtained in Feynman gauge.

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