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arXiv 0708.4297hep-phnucl-th
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宇称破坏的电子-质子弹性散射的双光子交换和γ Z交换修正

The Two-Photon-Exchange and γZ-Exchange Corrections to parity-Violating Elastic Electron-Proton Scattering

Hai Qing Zhou, Chung Wen Kao, Shin Nan Yang

摘要:

在精密测量奇异形状因子的过程中,超前电弱修正起着重要的作用。在一个简单的强子模型中,考虑质子的有限尺寸,计算了电子-质子弹性散射宇称破坏不对称性的双光子交换修正和$γZ$交换修正。我们发现两者都可以达到百分之几,并与目前实验测量的质子中性弱流中的奇夸克效应的大小相媲美。$γZ$ -交换的效果通常大于TPE的效果,特别是在低动量传递$Q^2\le 1 GeV^2$时。它们对最近实验中提取的$G^s_E+βG^s_M$值的组合影响在某些运动学中可高达~ 40%。

英文摘要:

Leading electroweak corrections play an important role in precision measurements of the strange form factors. We calculate the two-photon-exchange (TPE) and $γZ$-exchange corrections to the parity-violating asymmetry of the elastic electron-proton scattering in a simple hadronic model including the finite size of the proton. We find both can reach a few percent and are comparable in size with the current experimental measurements of strange-quark effects in the proton neutral weak current. The effect of $γZ$-exchange is in general larger than that of TPE, especially at low momentum transfer $Q^2\le 1 GeV^2$. Their combined effects on the values of $G^s_E+βG^s_M$ extracted in recent experiments can be as large as -40% in certain kinematics.

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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