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题名: Proper identification of the gluon spin
作者: Chen, Xiang-Song1, 2; Sun, Wei-Min2, 3, 4; Wang, Fan2, 3, 4; Goldman, T.5
刊名: PHYSICS LETTERS B
出版日期: 2011-05-30
卷号: 700, 期号:1, 页码:21-24
关键词: Gluon spin ; Spin structure ; Static term ; Gauge invariance
DOI: 10.1016/j.physletb.2011.04.045
文章类型: Article
英文摘要: Properties of the recently proposed gauge-invariant gluon spin S(g) are studied and compared to the usually defined "gluon polarization" Delta g. By explicit 1-loop calculations in a quark state. it is found that S(g) = 5/9 Delta g. Furthermore, 4/5 of S(g) can actually be identified as a "static-field" contribution and shown to cancel exactly an analogous static term in the gluon orbital angular momentum L(g), leaving S(g) + L(g) unaltered. These observations suggest that by an alternative definition, the gluon contribution to the nucleon spin may be drastically smaller than in the conventional wisdom. (C) 2011 Elsevier B.V. All rights reserved.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Physics, Multidisciplinary
研究领域[WOS]: Physics
收录类别: SCI
语种: 英语
WOS记录号: WOS:000291578800005
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15963
Appears in Collections:星系中的恒星形成研究团组_期刊论文

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作者单位: 1.Huazhong Univ Sci & Technol, Dept Phys, Wuhan 430074, Peoples R China
2.Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
3.Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
4.Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Peoples R China
5.Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA
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