Lattice computations of small-x parton distributions in a model of parton densities in very large nuclei

被引:19
作者
Gavai, RV [1 ]
Venugopalan, R [1 ]
机构
[1] UNIV WASHINGTON,INST NUCL THEORY,SEATTLE,WA 98195
来源
PHYSICAL REVIEW D | 1996年 / 54卷 / 09期
关键词
D O I
10.1103/PhysRevD.54.5795
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Using weak coupling methods McLerran and Venugopalan expressed the parton distributions in large nuclei as correlation functions of a two-dimensional Euclidean field theory. The theory has the dimensionful coupling g(2) mu, where mu(2)-A(1/3) is the valence quark color charge squared per unit area. We use a lattice regularization to investigate these correlation functions both analytically and numerically for the simplified case of SU(2) gauge theory. In weak coupling (g(2) mu L much less than 5), where L is the transverse size of the nucleus, the numerical results agree with the analytic lattice weak coupling results. For g(2) mu L much less than 5, no solutions exist at O(a(4)) where a is the lattice spacing. This suggests an ill-defined infrared behavior for the two-dimensional theory. A recent proposal of Jalilian-Marian, Kovner, McLerran, and Weigert for an analytic solution of the classical problem is discussed briefly.
引用
收藏
页码:5795 / 5803
页数:9
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