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arXiv 0711.0143nucl-thhep-ph
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双玻色子交换对宇称破坏e-p散射的影响

Effect of two-boson exchange on parity-violating e-p scattering

J. A. Tjon, W. Melnitchouk

摘要:

计算了宇称违反弹性散射中双光子和光子-Z交换的修正,用于提取质子的奇异形状因子。我们使用的强子形式主义,成功地调和了早期的质子的电子磁形状因子比的差异,适当地扩展到弱部门。通过实际的电弱形状因子,我们发现在Q^2 < 0.1 GeV^2的情况下,效应的数量级为2-3%,在后向角处最大,在低Q^2时对Q^2有很强的依赖性。我们发现,在低Q^2和前向角下,双玻色子对弱轴向流的贡献会增强。我们提供了最近和即将到来的宇称违反实验相关的运动学校正。

英文摘要:

We compute the corrections from two-photon and photon-Z exchange in parity-violating elastic electron-proton scattering, used to extract the strange form factors of the proton. We use a hadronic formalism that successfully reconciled the earlier discrepancy in the proton's electron to magnetic form factor ratio, suitably extended to the weak sector. Implementing realistic electroweak form factors, we find effects of the order 2-3% at Q^2 < 0.1 GeV^2, which are largest at backward angles, and have a strong Q^2 dependence at low Q^2. Two-boson contributions to the weak axial current are found to be enhanced at low Q^2 and for forward angles. We provide corrections at kinematics relevant for recent and upcoming parity-violating 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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