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Gauge Invariance of Resummation Schemes: The QCD Partition Function
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 fi...
Autores principales: | , , , |
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Lenguaje: | eng |
Publicado: |
1996
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1006/aphy.1997.5730 http://cds.cern.ch/record/316166 |
_version_ | 1780890383287320576 |
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author | Achhammer, M. Heinz, Ulrich W. Leupold, S. Wiedemann, U.A. |
author_facet | Achhammer, M. Heinz, Ulrich W. Leupold, S. Wiedemann, U.A. |
author_sort | Achhammer, M. |
collection | CERN |
description | 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. |
id | cern-316166 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 1996 |
record_format | invenio |
spelling | cern-3161662023-03-14T18:54:20Zdoi:10.1006/aphy.1997.5730http://cds.cern.ch/record/316166engAchhammer, M.Heinz, Ulrich W.Leupold, S.Wiedemann, U.A.Gauge Invariance of Resummation Schemes: The QCD Partition FunctionParticle Physics - TheoryWe 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.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.hep-th/9612033TPR-96-23oai:cds.cern.ch:3161661996-12-03 |
spellingShingle | Particle Physics - Theory Achhammer, M. Heinz, Ulrich W. Leupold, S. Wiedemann, U.A. Gauge Invariance of Resummation Schemes: The QCD Partition Function |
title | Gauge Invariance of Resummation Schemes: The QCD Partition Function |
title_full | Gauge Invariance of Resummation Schemes: The QCD Partition Function |
title_fullStr | Gauge Invariance of Resummation Schemes: The QCD Partition Function |
title_full_unstemmed | Gauge Invariance of Resummation Schemes: The QCD Partition Function |
title_short | Gauge Invariance of Resummation Schemes: The QCD Partition Function |
title_sort | gauge invariance of resummation schemes: the qcd partition function |
topic | Particle Physics - Theory |
url | https://dx.doi.org/10.1006/aphy.1997.5730 http://cds.cern.ch/record/316166 |
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