arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2408.09249hep-ph
收藏

平行自旋情况下弹性 $e \vec p \to \vec e p$ 和 $\vec e \vec p \to e p$ 过程中的极化效应

Polarization effects in the elastic $e \vec p \to \vec e p$ and $\vec e \vec p \to e p$ processes in the case of parallel spins

M. V. Galynskii, V. V. Bytev, V. M. Galynsky

AI总结:

本文在单光子交换近似下,分析了平行自旋下弹性电子-质子散射的极化效应,发现散射电子纵向极化度对Sachs形状因子标度破坏敏感,可用于测量比值R,而双自旋不对称性不敏感,可测试R≈1。

摘要:

在单光子交换近似下,我们分析了当静止靶质子与入射或散射电子的自旋量子化轴平行时,弹性 $\vec e \vec p \to e p$ 和 $ e \vec p \to \vec e p$ 过程中的极化效应。为此,在 SANE 合作组实验的运动学下,利用 J. Kelly 和 I. Qattan 对 Sachs 形状因子比值 $R\equiv μ_p G_E/G_M$ 的参数化,对 $e \vec p \to \vec e p$ 过程中转移给散射电子的纵向极化度以及 $\vec e \vec p \to e p$ 过程中的双自旋不对称性随转移给质子的动量平方及电子散射角的依赖关系进行了数值分析。研究确定,在 $ e \vec p \to \vec e p$ 过程中,当 Sachs 形状因子的标度守恒与破坏时,散射电子纵向极化度的差异可达 70 \\%。这一事实可用于设置新型极化实验来测量比值 $R$。对于 $\vec e \vec p \to e p$ 过程中的双自旋不对称性,相应差异不超过 2.32 \\%。这意味着它对 Sachs 形状因子标度破坏效应不敏感,可用作 $R\approx 1$ 等式的测试。

英文摘要:

In the one-photon exchange approximation, we analyze polarization effects in the elastic $\vec e \vec p \to e p$ and $ e \vec p \to \vec e p$ processes in the case when the spin quantization axes of a target proton at rest and an incident or scattered electron are parallel. To do this, in the kinematics of the SANE Collaboration experiment, using the J. Kelly and I. Qattan parametrizations for the Sachs form factor ratio $R\equiv μ_p G_E/G_M$, a numerical analysis was carried out of the dependence of the longitudinal polarization degree transferred to the scattered electron in the $e \vec p \to \vec e p$ process and double spin asymmetry in the $\vec e \vec p \to e p$ process on the square of the momentum transferred to the proton as well as on the scattering angle of the electron. It is established that the difference in the longitudinal polarization degree of the scattered electron in the $ e \vec p \to \vec e p$ process in the case of conservation and violation of the scaling of the Sachs form factors can reach 70 \%. This fact can be used to set up polarization experiments of a new type to measure the ratio $R$. For double spin asymmetry in the $\vec e \vec p \to e p$ process, the corresponding difference does not exceed 2.32 \%. This fact means that it's not sensitive to the effects of the Sachs form factor scaling violation and could be used as test for the $R\approx 1$ equality.

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。

↑