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arXiv 0704.1791hep-ph
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导致核子轨道量子结构的手征机制

Chiral Mechanisms Leading to Orbital Quantum Structures in the Nucleon

Dennis Sivers

摘要:

色禁闭和手征对称性是强子物理研究的重要领域。任何强子都可以被定义为夸克和胶子的色单重复合系统,这是qcd的基本场,而强子谱的景观主要是由两种夸克味,u和d,与这个理论的基本尺度相比,其质量很小。对核子颜色成分的轨道角动量敏感的测量以独特的方式显示手征动力学和禁闭的相互作用。在Georgi-Manohar手征夸克模型的背景下,对不同夸克味的轨道结构函数和Boer-Mulders函数的归一化进行评估,可以探索这一盛会。手征夸克模型中的分辨结构代表了组分夸克模型中由核子的量子数定义的受限系统的柯林斯函数的估计。反夸克的轨道结构函数也可以在这种方法的基本框架内指定,而胶子轨道结构函数的归一化需要一些额外的假设。

英文摘要:

Color confinement and chiral symmetry specify some important territory for the study of hadronic physics. Any hadron can be defined as a color-singlet composite system of qurks and gluons, the fundamental fields of qcd, while the landscape of the hadronic spectrum is dominated by the fact that two quark flavors, u and d, are characterized by masses small compared to the fundamental scale of this theory. Measurements sensitive to the orbital angular momenta of the color constituents of the nucleon display the interplay of chiral dynamics and confinement in a unique manner. This pageant can be explored by an evaluation, within the context of the Georgi-Manohar chiral quark model, of the normalization of the orbital structure functions and the normalization of the Boer-Mulders functions for different quark flavors. The resolution structures in the chiral quark model represent an evaluation of Collins functions for a confined system defined by the quantum numbers of the nucleon in the constituent quark model. The orbital structure functions for antiquarks can also be specified within the basic framework of this approach while the normalization of the gluon orbital structure function requires some additional assumptions.

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