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arXiv 1003.4300hep-phnucl-exnucl-th
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电子宇称破缺散射的色散修正

Dispersion corrections to parity violating electron scattering

M. Gorchtein, C. J. Horowitz, M. J. Ramsey-Musolf

摘要:

考虑了\gammaZ交换引起的电子-质子弹性宇称破缺散射的色散修正。在最近的一份出版物中,据报告,这一修正远远大于先前的估计。在本文中,我们更详细地研究了色散校正。我们确定了用于测量质子弱电荷的QWEAK实验的消除校正的大小为6%。我们列举的参数,必须被约束到优于相对30%,以保持控制下的QWEAK的理论不确定性。

英文摘要:

We consider the dispersion correction to elastic parity violating electron-proton scattering due to \gammaZ exchange. In a recent publication, this correction was reported to be substantially larger than the previous estimates. In this paper, we study the dispersion correction in greater detail. We confirm the size of the disperion correction to be 6% for the QWEAK experiment designed to measure the proton weak charge. We enumerate parameters that have to be constrained to better than relative 30% in order to keep the theoretical uncertainty for QWEAK under control.

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