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arXiv 1409.4677hep-phnucl-th
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夸克自旋轨道关联

Quark spin-orbit correlations

Cédric Lorcé

摘要:

质子自旋之谜的问题集中在部分子自旋和轨道角动量对质子自旋的贡献上。然而,质子自旋结构的完整表征还需要部分子自旋轨道相关的知识。我们证明了这个量可以用可测部分子分布的矩来表示。利用关于价夸克的唯象信息,我们得出结论,这种相关性是负的,这意味着价夸克自旋和动力学轨道角动量平均是相反的。夸克自旋轨道关联也可以用相对论性相空间分布更直观地表示,它可以看作是标准广义部分子分布和横动量相关部分子分布的母分布。我们在这里提出的第一次这些相空间分布的一般多极分解的一些例子。

英文摘要:

The proton spin puzzle issue focused the attention on the parton spin and orbital angular momentum contributions to the proton spin. However, a complete characterization of the proton spin structure requires also the knowledge of the parton spin-orbit correlation. We showed that this quantity can be expressed in terms of moments of measurable parton distributions. Using the available phenomenological information about the valence quarks, we concluded that this correlation is negative, meaning that the valence quark spin and kinetic orbital angular momentum are, in average, opposite. The quark spin-orbit correlation can also be expressed more intuitively in terms of relativistic phase-space distributions, which can be seen as the mother distributions of the standard generalized and transverse-momentum dependent parton distributions. We present here for the first time some examples of the general multipole decomposition of these phase-space distributions.

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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