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arXiv 0905.0282hep-ph
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电子-质子弹性散射中的双光子交换:QCD分解方法

Two-photon exchange in elastic electron-proton scattering : QCD factorization approach

Nikolai Kivel, Marc Vanderhaeghen

摘要:

我们估计了在大动量转移$Q^2$下双光子交换对电子-质子弹性散射的贡献。结果表明,主导双光子交换振幅相对于单光子振幅表现为$1/Q^4$,并且可以用主导扭曲核子分布振幅以模型无关的方式表示.使用几种模型的核子分布振幅,我们提供现有的数据和正在进行的实验的估计。

英文摘要:

We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer $Q^2$. It is shown that the leading two-photon exchange amplitude behaves as $1/Q^4$ relative to the one-photon amplitude, and can be expressed in a model independent way in terms of the leading twist nucleon distribution amplitudes. Using several models for the nucleon distribution amplitudes, we provide estimates for existing data and for ongoing experiments.

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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