Do Gluons Carry Half of the Nucleon Momentum?

被引：83

作者：

Chen, Xiang-Song ^{[1
,2
,3
]}

Sun, Wei-Min ^{[3
]}

Lue, Xiao-Fu ^{[2
]}

Wang, Fan ^{[3
]}

Goldman, T. ^{[4
]}

机构：

[1] Huazhong Univ Sci & Technol, Dept Phys, Wuhan 430074, Peoples R China

[2] Sichuan Univ, Dept Phys, Chengdu 610064, Peoples R China

[3] Nanjing Univ, Dept Phys, CPNPC, Nanjing 210093, Peoples R China

[4] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.103.062001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We examine the conventional picture that gluons carry about half of the nucleon momentum in the asymptotic limit. We show that this large fraction is due to an unsuitable definition of the gluon momentum in an interacting theory. If defined in a gauge-invariant and consistent way, the asymptotic gluon momentum fraction is computed to be only about one-fifth. This result suggests that the asymptotic limit of the nucleon spin structure should also be reexamined. A possible experimental test of our finding is discussed in terms of novel parton distribution functions.

引用

页数：4

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