Nonzero Mean Squared Momentum of Quarks in the Non-Perturbative QCD Vacuum

Li-Juan Zhou (Department of Information , Computing Science , Guangxi University of Technology , Liuzhou , P. R. China , Institute of Particle Physics , Hua-zhong Normal University , Wuhan

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P. R. China) Leonard S. Kisslinger (Department of Physics Carnegie-Mellon University Pittsburgh PA USA) Wei-xing Ma (Institute of High Energy Physics Chinese Academy of Sciences Beijing

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classification ✦ hep-ph

keywords vacuumquarkscondensatesquarkvirtualitycondensategluonslocal

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The non-local vacuum condensates of QCD describe the distributions of quarks and gluons in the non-perturbative QCD vacuum. Physically, this means that vacuum quarks and gluons have nonzero mean-squared momentum, called virtuality. In this paper we study the quark virtuality which is given by the ratio of the local quark-gluon mixed vacuum condensate to the quark local vacuum condensate. The two vacuum condensates are obtained by solving Dyson-Schwinger Equations of a fully dressed quark propagator with an effective gluon propagator. Using our calculated condensates, we obtain the virtuality of quarks in the QCD vacuum state. Our numerical predictions differ from the other theoretical model calculations such as QCD sum rules, Lattice QCD and instanton models.

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Nonzero Mean Squared Momentum of Quarks in the Non-Perturbative QCD Vacuum

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