arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1307.0699hep-ph
收藏

协变方法中的质子自旋

Proton spin in leading order of the covariant approach

Petr Zavada

摘要:

我们研究协变版本的夸克-部分子模型,其中角动量组成的一般规则被准确地考虑。我们展示了这些规则如何影响夸克自旋和轨道角动量之间的相对论相互作用,这共同有助于质子自旋。研究了多夸克态$J=1/2$对应的自旋结构函数$g_{1}$和$g_{2}$,发现它们满足与质子自旋含量$ΔΣ\lesssim1/3$等实验数据相一致的约束和关系.所建议的洛伦兹不变的三维方法计算的结构函数的方法与传统的共线部分子模型的基础上进行了比较。

英文摘要:

We study the covariant version of the quark-parton model, in which the general rules of the angular momentum composition are accurately taken into account. We demonstrate how these rules affect the relativistic interplay between the quark spins and orbital angular momenta, which collectively contribute to the proton spin. The spin structure functions $g_{1}$ and $g_{2}$ corresponding to the many-quark state $J=1/2$ are studied and it is shown they satisfy constraints and relations well compatible with the available experimental data including proton spin content $ΔΣ\lesssim1/3$. The suggested Lorentz invariant 3D approach for calculation of the structure functions is compared with the approach based on the conventional collinear parton model.

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。

↑