Light-cone representation of the spin and orbital angular momentum of relativistic composite systems

	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
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
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.
学科主题	Physics
类目[WOS]	Physics, Particles & Fields
研究领域[WOS]	Physics
原文出处	SCI
语种	英语
WOS记录号	WOS:000166412400012
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/236917]
专题	高能物理研究所_理论物理室
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	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.