Light-cone representation of the spin and orbital angular momentum of relativistic composite systems
Brodsky, SJ; Hwang, DS; Ma BQ(马伯强); Ma, BQ; Schmidt, I
刊名NUCLEAR PHYSICS B
2001
卷号593期号:1-2页码:311-335
学科分类Physics
DOI10.1016/S0550-3213(00)00626-X
通讯作者Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA ; Sejong Univ, Dept Phys, Seoul 143747, South Korea ; CCAST, World Lab, Beijing 100080, Peoples R China ; Peking Univ, Dept Phys, Beijing 100871, Peoples R China ; Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China ; Univ Tecn Federico Santa Maria, Dept Fis, Valparaiso, Chile
文章类型Article
英文摘要The matrix elements of local operators such as the electromagnetic current, the energy-momentum tensor, angular momentum, and the moments of structure functions have exact representations in terms of light-cone Fock state wavefunctions of bound states such as hadrons. We illustrate all of these properties by giving explicit light-cone wavefunctions for the two-particle Fock state of the electron in QED, thus connecting the Schwinger anomalous magnetic moment to the spin and orbital angular momentum carried by its Fock state constituents. We also compute the QED one-loop radiative corrections for the form factors for the graviton coupling to the electron and photon. Although the underlying model is derived from elementary QED perturbative couplings, it in fact can be used to simulate much more general bound state systems by applying spectral integration over the constituent masses while preserving all of the Lorentz properties, giving explicit realization of the spin sum rules and other local matrix elements. The role of orbital angular momentum in understanding the "spin crisis" problem for relativistic systems is clarified. We also prove that the anomalous gravitomagnetic moment B(0) vanishes for any composite system. This property is shown to follow directly from the Lorentz boost properties of the light-cone Fock representation and holds separately for each Fock state component. We show how the QED perturbative structure can be used to model bound state systems while preserving all Lorentz properties. We thus obtain a theoretical laboratory to test the consistency of formulae which have been proposed to probe the spin structure of hadrons. (C) 2001 Elsevier Science B.V. All rights reserved.
类目[WOS]Physics, Particles & Fields
研究领域[WOS]Physics
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语种英语
WOS记录号WOS:000166412400012
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被引频次:217[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/236917
专题中国科学院高能物理研究所_理论物理室_期刊论文
作者单位中国科学院高能物理研究所
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Brodsky, SJ,Hwang, DS,Ma BQ,et al. Light-cone representation of the spin and orbital angular momentum of relativistic composite systems[J]. NUCLEAR PHYSICS B,2001,593(1-2):311-335.
APA Brodsky, SJ,Hwang, DS,马伯强,Ma, BQ,&Schmidt, I.(2001).Light-cone representation of the spin and orbital angular momentum of relativistic composite systems.NUCLEAR PHYSICS B,593(1-2),311-335.
MLA Brodsky, SJ,et al."Light-cone representation of the spin and orbital angular momentum of relativistic composite systems".NUCLEAR PHYSICS B 593.1-2(2001):311-335.
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