1Department of Information and Computing Sciences, Guangxi University of Technology, Liuzhou 545006
2Department of Physics, Guangxi University, Nanning 530004
3Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039
Quark Virtuality and QCD Vacuum Condensates
ZHOU Li-Juan1,2;MA Wei-Xing1,3
1Department of Information and Computing Sciences, Guangxi University of Technology, Liuzhou 545006
2Department of Physics, Guangxi University, Nanning 530004
3Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039
Abstract： Based on the Dyson--Schwinger equations (DSEs) in the `rainbow' approximation, we investigate the quark virtuality in the vacuum state and quantum-chromodynamics (QCD) vacuum condensates. In particular, we calculate the local quark vacuum condensate and quark-gluon mixed condensates, and then the virtuality of quark. The calculated quark virtualities are λ 2u,d = 0.7GeV2 for u,d quarks, and λ 2s = 1.6GeV2 for s quark. Our theoretical predictions are consistent with empirical values used in QCD sum rules, and also fit to lattice QCD predictions.
2004, Vol. 21 
