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Proper identification of the gluon spin
Chen, Xiang-Song1,2; Sun, Wei-Min2,3,4; Wang, Fan2,3,4; Goldman, T.5
Source PublicationPHYSICS LETTERS B
AbstractProperties 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.
KeywordGluon Spin Spin Structure Static Term Gauge Invariance
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000291578800005
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Document Type期刊论文
Affiliation1.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
Recommended Citation
GB/T 7714
Chen, Xiang-Song,Sun, Wei-Min,Wang, Fan,et al. Proper identification of the gluon spin[J]. PHYSICS LETTERS B,2011,700(1):21-24.
APA Chen, Xiang-Song,Sun, Wei-Min,Wang, Fan,&Goldman, T..(2011).Proper identification of the gluon spin.PHYSICS LETTERS B,700(1),21-24.
MLA Chen, Xiang-Song,et al."Proper identification of the gluon spin".PHYSICS LETTERS B 700.1(2011):21-24.
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