Direct instantons and nucleon magnetic moments

被引：14

作者：

Aw, M

Banerjee, MK

Forkel, H

机构：

[1] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[2] Univ Heidelberg, Inst Theoret Phys, D-69120 Heidelberg, Germany

来源：

PHYSICS LETTERS B | 1999年 / 454卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(99)00358-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We calculate the leading direct-instanton contributions to the operator product expansion of the nucleon correlator in a magnetic background field and set up improved QCD sum rules for the nucleon magnetic moments. Remarkably, the instanton contributions are found to affect only those sum rules which had previously been considered unstable. The new sum rules show good stability and reproduce the experimental Values of the nucleon magnetic moments with values of chi, the quark condensate magnetic susceptibility, consistent with other estimates. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：147 / 154

页数：8

共 42 条

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