Perturbative QCD with Quark and Gluon Condensates

Details Perturbative QCD with Quark and Gluon Condensates Perturbative QCD with Quark and Gluon Condensates

2002-09-26

arxiv.org/abs/hep-ph/0209318v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk at ICHEP 2002, Amsterdam (July 2002). 3 pages, 2 figures

Scientific paper

The quark <\bar\psi \psi> and gluon vacuum expectation values are non-vanishing at low orders in \alpha_s when the perturbative ground state includes quark and gluon pairs. This offers possibilities of studying the effects of a non-trivial vacuum using formally exact perturbative methods. The QCD Feynman rules are modified only for the free, on-shell quark and gluon propagators at zero four-momentum. Gauge and lorentz invariance is maintained, while chiral symmetry is spontaneously broken by the ground state.

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