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arXiv 0910.0719nucl-thhep-ph
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自旋和规则与极化率

Spin Sum Rules and Polarizabilities

D. Drechsel

摘要:

Gerasimov-Drell-Hearn求和规则和相关的色散积分将真实和虚拟康普顿散射与包含的光生和电生联系起来。这些关系基于因果性、么正性和规范不变性等普遍原则,为研究将系统保持在一起的内部自由度提供了一个独特的试验场。本文综述了核子自旋相关求和规则和核子截面。在小的动量转移,数据样本信息的长期现象(戈德斯通玻色子和集体共振),而主要的自由度(夸克和胶子)成为可见的大动量转移(短距离)。丰富的新数据涵盖了广泛的现象,从相干到非相干的过程,并从广义自旋极化率的低能量侧更高的扭曲效应在深非弹性散射。

英文摘要:

The Gerasimov-Drell-Hearn sum rule and related dispersive integrals connect real and virtual Compton scattering to inclusive photo- and electroproduction. Being based on universal principles as causality, unitarity, and gauge invariance, these relations provide a unique testing ground to study the internal degrees of freedom that hold a system together. The present contribution reviews the spin-dependent sum rules and cross sections of the nucleon. At small momentum transfer, the data sample information on the long range phenomena (Goldstone bosons and collective resonances), whereas the primary degrees of freedom (quarks and gluons) become visible at large momentum transfer (short distance). The rich body of new data covers a wide range of phenomena from coherent to incoherent processes, and from the generalized spin polarizabilities on the low-energy side to higher twist effects in deep inelastic scattering.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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