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arXiv 0705.3385hep-phnucl-th
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弹性电子-质子散射中双光子效应的模型无关提取

Model-independent extraction of two-photon effects in elastic electron-proton scattering

M. A. Belushkin, H. -W. Hammer, U. -G. Meißner

摘要:

本文讨论了核子电磁形状因子的Rosenbluth和极化转移数据之间的差异。假设双光子修正对偏振转移数据的影响可以忽略,我们得到了与模型无关的双光子修正Δ ^(2γ)的估计。利用色散关系分别对偏振传输数据和截面数据进行了分析。然后,通过比较两种分析,获得Delta^(2γ)的中心值和误差估计。所得的Delta^(2γ)值与文献中的直接计算结果非常一致。

英文摘要:

We address the discrepancy between the Rosenbluth and polarization transfer data for the electromagnetic form factors of the nucleon. Assuming that the effect of two-photon corrections on the polarization transfer data is negligible, we obtain a model-independent estimate of the two-photon correction Delta^(2γ). We analyze the polarization transfer data and the cross section data separately using dispersion relations. A central value as well as an error estimate for Delta^(2γ) is then obtained from a comparison of the two analyses. The resulting values for Delta^(2γ) are in good agreement with direct calculations available in the literature.

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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