Quark confinement and color transparency in a gauge-invariant formulation of QCD

被引:7
作者
Chen, LS [1 ]
Haller, K [1 ]
机构
[1] Univ Connecticut, Dept Phys, Storrs, CT 06269 USA
来源
INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 1999年 / 14卷 / 17期
关键词
D O I
10.1142/S0217751X99001378
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
We examine a nonlocal interaction that results from expressing the QCD Hamiltonian entirely in terms of gauge-invariant quark and gluon fields. The interaction couples one quark color-charge density to another, much as electric charge densities are coupled to each other by the Coulomb interaction in QED. In QCD, this nonlocal interaction also couples quark color-charge densities to gluonic color. We show how the leading part of the interaction between quark color-charge densities vanishes when the participating quarks are in a color singlet configuration, and that, for singlet configurations, the residual interaction weakens as the size of a packet of quarks shrinks. Because of this effect, color-singlet packets of quarks should experience final state interactions that increase in strength as these packets expand in size. For the case of an SU(2) model of QCD based on the ansatz that the gauge-invariant gauge field is a hedgehog configuration, we show how the infinite series that represents the nonlocal interaction between quark color-charge densities can be evaluated nonperturbatively, without expanding it term-by-term. We discuss the implications of this model for QCD with SU(3) color and a gauge-invariant gauge field determined by QCD dynamics.
引用
收藏
页码:2745 / 2767
页数:23
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