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arXiv 2307.03098hep-phhep-th
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无质量QED中含一个离壳光子和一个在壳光子的轻子对散射的两圈计算

Lepton-pair scattering with an off-shell and an on-shell photon at two loops in massless QED

Simon Badger, Jakub Kryś, Ryan Moodie, Simone Zoia

AI总结:

本研究计算无质量QED中含离壳、在壳光子的轻子对散射两圈螺旋度振幅,用多重对数基表示主积分并通过有限域数值重构解析形式,补全MUonE实验所需的eμ散射N³LO预言的振幅组分。

摘要:

我们采用无质量轻子近似,计算了轻子对与一个离壳光子、一个在壳光子散射过程($0\to\ell\bar\ellγγ^*$)的两圈QED螺旋度振幅。我们将单条外腿离壳的四无质量粒子散射到两圈阶的所有相关主积分,表示为代数独立的多重对数基,确保了振幅的高效数值计算和紧致解析表示。振幅的解析形式通过有限域上的数值计算重构得到。我们的结果补全了电子-μ子散射$eμ\to eμ$的N$^3$LO(次次次领头阶)预言所需的振幅层面组分,这是满足未来MUonE实验精度目标的必要条件。

英文摘要:

We compute the two-loop QED helicity amplitudes for the scattering of a lepton pair with an off-shell and an on-shell photon, $0\to\ell\bar\ellγγ^*$, using the approximation of massless leptons. We express all master integrals relevant for the scattering of four massless particles with a single external off-shell leg up to two loops in a basis of algebraically independent multiple polylogarithms, which guarantees an efficient numerical evaluation and compact analytic representations of the amplitudes. Analytic forms of the amplitudes are reconstructed from numerical evaluations over finite fields. Our results complete the amplitude-level ingredients contributing to the N$^3$LO predictions of electron-muon scattering $eμ\to eμ$, which are required to meet the precision goal of the future MUonE 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。

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