arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.02706hep-phnucl-exnucl-th
收藏

$γp\rightarrow l^+l^-p$反应中Bethe-Heitler过程的首级修正

Leading order corrections to the Bethe-Heitler process in the $γp\rightarrow l^+l^-p$ reaction

Matthias Heller, Oleksandr Tomalak, Marc Vanderhaeghen, Shihao Wu

备注：
arXiv admin note: text overlap with arXiv:1802.07174
发表信息：
Phys. Rev. D 100, 076013 (2019)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

使用$γp\rightarrow l^+ l^- p$过程，在双μ子产生阈值之上和之下的质子上的双轻子产生截面的比率允许提取有效的轻子-质子相互作用，如果轻子普适性是精确的，则需要对于电子和μ子是相同的。为了测试在百分比水平上破碎的普适性的情况下，大小可以解释从电子散射和μ介子氢光谱中提取的不同质子电荷半径，我们评估了对这个过程的所有单圈QED校正，包括完整的轻子质量依赖性。此外，我们表明，双光子交换过程与两个光子连接到质子线消失后，平均双轻子角，并估计相对较小的质子辐射。我们比较了完整的单圈计算与软光子近似相同的顺序，并提出了一个计划的实验估计。

英文摘要：

The ratio of di-lepton production cross sections on a proton, using the $γp\rightarrow l^+ l^- p$ process, above and below di-muon production threshold allows to extract the effective lepton-proton interaction, which is required to be identical for electrons and muons if lepton universality is exact. To test for a scenario of broken universality at the percent level, of the size which could explain the different proton charge radii extracted from electron scattering and from muonic hydrogen spectroscopy, we evaluate all one-loop QED corrections to this process, including the full lepton mass dependencies. We furthermore show that two-photon exchange processes with both photons attached to the proton line vanish after averaging over di-lepton angles, and estimate the relatively small radiation off the proton. We compare the full one-loop calculation with a soft-photon approximation of the same order, and present estimates for a planned experiment.

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。

↑