Charge-asymmetric correlations in elastic lepton- and antilepton-proton scattering from real photon emission

Charge-asymmetric correlations in elastic lepton- and antilepton-proton scattering from real photon emission
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真实光子发射的弹性轻子和反轻子-质子散射中的电荷不对称相关性

DOI:
10.1140/epja/s10050-022-00805-8
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发表时间:
2022
期刊:
The European Physical Journal A
影响因子:
--
通讯作者:
Ilyichev, A.
Ilyichev, A.
中科院分区:
--
文献类型:
--
作者:
Afanasev, A.;Ilyichev, A.

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通过比较电子和正电子,或μ子和反μ子在强子靶上的散射来观察电荷不对称性,目前作为研究双光子交换效应的实验工具。除了双光子交换,真实的光子发射也对电荷不对称性有贡献。本文给出了轻子和反轻子-质子散射中电荷不对称性的硬光子发射的理论形式、显式表达式和数值分析。不同的运动学条件被认为是,无论是固定的转移动量平方或一个固定的轻子散射角。用Bardin-Shumeiko方法处理了来自真实的光子发射的红外发散,并用Tsai方法提取和计算了双光子交换贡献的软部分。所有的最终表达式得到超越超相对论近似的轻子质量,允许数值评估所考虑的影响,不仅为超相对论轻子(JLab),但适度相对论(MUSE)的运动学,太。
Observation of charge asymmetry by comparing electron and positron, or muon and anti-muon, scattering on a hadronic target presently serves as an experimental tool to study two-photon exchange effects. In addition to two-photon exchange, real photon emission also contributes to the charge asymmetry. We present a theoretical formalism, explicit expressions, and a numerical analysis of hard photon emission for the charge asymmetry in lepton- and antilepton-proton scattering. Different kinematic conditions are considered, namely, either fixed transferred momentum squared or a fixed lepton scattering angle. The infrared divergence from real photon emission is treated by the Bardin–Shumeiko technique and canceled with the soft part of the two-photon exchange contribution extracted and calculated using Tsai approach. All final expressions are obtained beyond the ultrarelativistic approximation with respect to the lepton mass that allows to evaluate numerically of the considered effects not only for ultrarelativistic leptons (JLab) and but for moderately relativistic (MUSE) kinematics, too.
Paul Scherrer 研究所实验 R-12-01.1 的技术设计报告:用 $mu p$ 弹性散射研究质子“半径”谜题
DOI: --
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DOI: 10.1016/j.physletb.2003.09.092
发表时间: 2003
期刊: Physics Letters B
影响因子: 4.4
作者:
I. Sick
通讯作者: I. Sick
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DOI: 10.1140/epja/s10050-021-00582-w
发表时间: 2021
期刊: The European Physical Journal A
影响因子: --
作者:
Afanasev, A.;Ilyichev, A.
通讯作者: Ilyichev, A.
DOI: --
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