论文标题
亲和核子相对论电磁四电流分布
Pion and nucleon relativistic electromagnetic four-current distributions
论文作者
论文摘要
量子空间方法允许人们以任意自旋和任意平均动量定义目标内部的相对论空间分布。在旋转$ 0 $和旋转的情况下，我们将这种准平稳型形式主义应用于整个电磁四电流操作员 - $ \ frac {1} {2} $ targets，详细研究相应的空间分布的框架依赖性，并将我们的结果与来自轻型形式的结果进行比较。尽管以前的工作重点是收费分布，但我们将调查扩展到当前的分布。我们阐明了Wigner旋转的作用，并认为电磁特性是从Sachs形式的情况下最自然地理解的，这与先前的光线形式相反。最后，我们使用从实验数据中提取的PION和核子电磁形式来说明了我们的结果。
The quantum phase-space approach allows one to define relativistic spatial distributions inside a target with arbitrary spin and arbitrary average momentum. We apply this quasiprobabilistic formalism to the whole electromagnetic four-current operator in the case of spin-$0$ and spin-$\frac{1}{2}$ targets, study in detail the frame dependence of the corresponding spatial distributions, and compare our results with those from the light-front formalism. While former works focused on the charge distributions, we extend here the investigations to the current distributions. We clarify the role played by the Wigner rotation and argue that electromagnetic properties are most naturally understood in terms of Sachs form factors, contrary to what the light-front formalism previously suggested. Finally, we illustrate our results using the pion and nucleon electromagnetic form factors extracted from experimental data.
