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首页> 外文期刊>Physical review, C >Suppression of hard two-photon-exchange contributions to Re+e- elastic scattering cross-section ratios: A phenomenological approach
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Suppression of hard two-photon-exchange contributions to Re+e- elastic scattering cross-section ratios: A phenomenological approach

机译：抑制硬两光节 - 交换贡献，重新+ e-弹性散射横截面比率：一种现象学方法

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摘要

We present a new extraction of the positron-proton and electron-proton elastic-scattering cross sections ratio Re+e- based on a new phenomenological parametrization of the two-photon-exchange (TPE) corrections to electron-proton (ep) elastic-scattering cross section sigma(R). We compare our results to several previous phenomeno-logical extractions, TPE hadronic calculations, and world data on the ratio Re+e-, including the recent direct measurements from the CLAS, VEPP-3, and OLYMPUS experiments. The ratio Re+e- as extracted from this work is consistent with unity, and shows little sensitivity to epsilon and essentially no Q(2) dependence, suggesting a smaller hard-TPE contribution to Re+e- than that predicted by several previous phenomenological extractions and TPE hadronic calculations. In this work, we show that, under certain assumptions and constraints imposed on the TPE amplitudes Y-E and Y-3, the proton magnetic form factor squared (G(M)(p))(2), and the proton form factors ratio mu R-p(p) = pG(E)(p)/G(M)(p), the TPE corrections to sigma(R) can be suppressed, yielding a small hard-TPE contribution to Re+e-. Our results are in agreement with the recent analysis by Bytev and Tomasi-Gustafsson [Phys. Rev. C 99, 025205 (2019)]. We believe that the assumption that hard-TPE corrections could account for the discrepancy in the ratio mu R-p(p) is still an open question.
机译：我们提取正电子 - 质子和电子质子弹性散射横截面比重新+ e-基于对电子质子（EP）弹性 - 质子（EP）矫正的新现象学校准校正散射横截面Sigma（R）。我们将结果与几个以前的现象逻辑提取，TPE重整计算和世界数据进行比较，包括RE + E-的世界数据，包括来自CLA，Vepp-3和奥林巴斯实验的最近直接测量。从该工作中提取的比率Re + E-与Unity一致，并且对epsilon表示很少的敏感性，并且基本上没有Q（2）依赖性，表明Re + E-贡献较小的硬度TPE贡献而不是通过几个以前的几种现象学预测的贡献提取和TPE重整计算。在这项工作中，我们表明，在施加在TPE幅度Ye和Y-3上施加的某些假设和约束，质子磁性形状系数平方（G（m）（p））（2），以及质子形状因子比率亩rp（p）= pg（e）（p）/ g（m）（p），可以抑制对Sigma（R）的TPE校正，从而产生重新+ e-的小硬化TPE贡献。我们的结果与最近的Bytev和Tomasi-Gustafsson [physon]的分析一致。 Rev. C 99,025205（2019）]。我们认为，假设硬TPE校正可以解释MU R-P（P）比率的差异仍然是一个开放的问题。

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