论文标题
照亮核子自旋
Illuminating the nucleon spin
论文作者
论文摘要
在此简短中，考虑了核子自旋和规则的QED扩展。为此，计算了Quark/Gluon螺旋性和轨道 - 角度 - 摩肌（OAM）分布的前阶（LO）QED进化核，以及首次引入的Lepton和Photon Analogue分布。在QCD和QED中，还计算了后者的LO演化核。将核子旋转总和规则全部结合在一起，如预期的那样，在QCD $ \ times $ QED中保持规模不变，这代表了新获得的结果的检查。这一理论发展将来将允许对Lepton和Photon分布对细胞核自旋的贡献进行量化，并对不确定性进行更精确的控制。
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.
