Gluon spin in the nucleon

被引：78
|
作者：
Jaffe, RL
机构：
[1] MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA
[2] MIT, LYMAN LAB PHYS, CAMBRIDGE, MA 02139 USA
来源：
PHYSICS LETTERS B | 1996年 / 365卷 / 1-4期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1016/0370-2693(95)01247-8
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the gluon spin contribution (Gamma) to the nucleon's spin as measured in hard QCD processes. Gamma can be related to the forward matrix element of a local gluon operator in A(+) = 0 gauge. In quark models the nucleon contains ambient color electric and magnetic fields. The latter are thought to be responsible for spin splittings among the light baryons. These fields give rise to a significant negative contribution to Gamma at the quark model renormalization scale, mu(0)(2). In a generic nonrelativistic quark model Gamma(NQM) = -8/9 (alpha(NQM)/m(q)) [l/r], in the bag model Gamma(bag) = -0.1 alpha(bag). These correspond to Gamma(NQM) approximate to -0.7 and Gamma(bag) approximate to -0.4 at alpha(QCD) approximate to 1.0.
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页码：359 / 366
页数：8
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