Polarized structure functions in QCD
Polarized structure functions in QCD
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DOI：
10.1143/ptp.101.191
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发表时间：
1998-12
影响因子：
--
通讯作者：
J. Kodaira;Kazuhiro Tanaka
中科院分区：
文献类型：
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作者：
J. Kodaira;Kazuhiro Tanaka
强子自旋物理学现在是物理学中最活跃的领域之一。特别是在过去的十年里，理论和实验都取得了巨大的进步，极大地提高了我们对核子自旋结构的认识。我们从因子分解定理和 QCD 中规范不变、非局域光锥算子的角度回顾了核子的偏振结构函数。我们讨论了极化结构函数和相应的部分子分布函数的系统处理，这些函数与包容性的轻子和强子生产相关。我们在twist-2和twist-3水平上对这些自旋相关的分布函数进行了详细分析，并提出了parton分布满足的各种属性和关系，这些属性和关系可以直接从QCD导出。我们强调较高扭曲分布的独特特征，以及 QCD 运动方程的作用，以导出它们对夸克-胶子相关性的敏感性及其 Q 2 演化的反常维度。
Hadron spin physics is now one of the most active fields of physics. Especially in the last ten years, great progress has been made both theoretically and experimentally that has considerably improved our knowledge of the spin structure of nucleons. We review the nucleon’s polarized structure functions fromthe viewpoint of factorization theorem s and the gauge invariant, nonlocal light-cone operators in QCD. We discuss a systematic treatment of the polarized structure functions and the corresponding parton distribution functions, which are relevant to inclusive lepto- and hadro-production. We give a detailed analysis of these spin-dependent distribution functions at the twist-2 and twist-3 level, and present various properties and relations satisfied by the parton distributions, which can be derived directly fromQCD. We em phasize unique features of higher twist distributions, and the role of the QCD equations of motion to derive their sensitivity to the quark-gluon correlation and their anomalous dimensions for Q 2 -evolution.