STRANGE FORM-FACTORS, THE SIGMA-TERM AND STRANGE QUARK DISTRIBUTIONS IN THE GROSS-NEVEU MODEL

被引：6

作者：

BURKARDT, M

机构：

[1] Stanford Linear Accelerator Center, Stanford University, Stanford

来源：

PHYSICS LETTERS B | 1991年 / 268卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(91)91600-Z

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

For N(c) --> infinity the structure function of physical fermions in the Gross-Neveu model is of pure valence type. Nevertheless several strange form factors of u-quarks, including the induced magnetic moment and the sigma-term acquire substantial O(N(c)0) contributions from virtual ssBAR pairs. Those arise from matrix elements which are off-diagonal in Fock space, i.e., they do not have a simple interpretation in terms of the quark distributions. It is shown that, under certain circumstances, a similar behavior in QCD3+1 is conceivable.

引用

页码：419 / 423

页数：5

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