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arXiv 2202.12249hep-ph
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阐明核子自旋

Illuminating the nucleon spin

Miguel G. Echevarria

摘要:

本文考虑核子自旋和规则的QED推广。为此,计算了夸克/胶子螺旋度和轨道角动量分布的首阶QED演化核,并首次引入了它们的轻子和光子模拟分布.在QCD和QED中计算了后者的LO演化核。综上所述,核子自旋和规则在QCD $\times$ QED中保持标度不变,正如预期的那样,这代表了对新获得的结果的检查。这一理论的发展将允许在未来的轻子和光子分布的贡献的核子自旋的量化,和更精确的控制的不确定性。

英文摘要:

In this short note the QED extension of the nucleon spin sum rule is considered. To this end, the leading-order (LO) QED evolution kernels for the quark/gluon helicity and orbital-angular-momentum (OAM) distributions are calculated, as well as their lepton and photon analogue distributions introduced for the first time. The LO evolution kernels of the latter are also calculated, both in QCD and QED. Putting all together, the nucleon spin sum rule remains scale-invariant in QCD$\times$QED, as expected, which represents a check of the newly obtained results. This theoretical development will allow in the future the quantification of the contributions of lepton and photon distributions to the nucleon spin, and a more precise control over the uncertainties.

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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