Virtualities of quark and gluon in QCD vacuum  

作　　者：ZHOU LiJuan1, QIN SongMei2, WU Qing3 & MA WeiXing4 1 Collaboration Group of Hadron Physics and Non-perturbative QCD Study, Guangxi University of Tech- nology, Liuzhou 545006, China 2 Department of Physics, Guangxi University, Nanning 540003, China 3 Department of Physics, Qingdao University, Qingdao 266071, China 4 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China 

出　　处：《Science China(Physics,Mechanics & Astronomy)》2008年第10期1439-1447,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 10647002 and 10565001) ;the Guangxi Science Foundation (Grant Nos. 0841030, 0542042 and 0575020)

摘　　要：The non-local vacuum condensates of quantum chromodynamics (QCD) describe the distributions of quarks and gluons in the non-perturbative QCD vacuum state. Physically, this means that vacuum quarks and gluons have a nonzero mean-squared momentum in the vacuum, called virtuality. The quark virtuality is given by the ratio of the local quark-gluon mixed vacuum condensate to the quark local vacuum condensate. The gluon virtuality is expressed by gluon vacuum condensates and four-quark vacuum condensates. We study the two virtualities by solving Dyson-Schwinger Equations and calculating quark and gluon vacuum condensates. Our theoretical results for quark virtuality are in good agreement with many other theoretical model predictions such as QCD sum rules and lattice QCD calculations. Our calculation on gluon virtuality is initial and the results are quite interesting.The non-local vacuum condensates of quantum chromodynamics (QCD) describe the distributions of quarks and gluons in the non-perturbative QCD vacuum state. Physically, this means that vacuum quarks and gluons have a nonzero mean-squared momentum in the vacuum, called virtuality. The quark virtuality is given by the ratio of the local quark-gluon mixed vacuum condensate to the quark local vacuum condensate. The gluon virtuality is expressed by gluon vacuum condensates and four-quark vacuum condensates. We study the two virtualities by solving Dyson-Schwinger Equations and calculating quark and gluon vacuum condensates. Our theoretical results for quark virtuality are in good agreement with many other theoretical model predictions such as QCD sum rules and lattice QCD calculations. Our calculation on gluon virtuality is initial and the results are quite interesting.

关 键 词：QUARK GLUON VIRTUALITY QCD vacuum CONDENSATE NON-PERTURBATIVE QCD 

分 类 号：O572.33[理学—粒子物理与原子核物理]