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arXiv 0812.3539hep-ph
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核子的电磁形状因子:新的拟合和不确定性分析

Electromagnetic form factors of the nucleon: new fit and analysis of uncertainties

W. M. Alberico, S. M. Bilenky, C. Giunti, K. M. Graczyk

摘要:

给出了由新的数据拟合得到的质子和中子的电磁形状因子。质子形状因子是通过同时拟合由极化转移测量确定的比率$μ_p G_{Ep}/G_{Mp}$和$ep$弹性截面数据获得的。现象学的双光子交换校正考虑在内。在$Q^2\in (0,6)$ GeV $^2$的运动学区域中对质子进行本拟合。对于质子和中子,我们都使用最新的可用数据。对于所有的形状因子的形状因子参数的不确定性和相关性的$χ^2$方法进行了研究。

英文摘要:

Electromagnetic form factors of proton and neutron, obtained from a new fit of data, are presented. The proton form factors are obtained from a simultaneous fit to the ratio $μ_p G_{Ep}/G_{Mp}$ determined from polarization transfer measurements and to $ep$ elastic cross section data. Phenomenological two-photon exchange corrections are taken into account. The present fit for proton was performed in the kinematical region $Q^2\in (0,6)$ GeV$^2$. Both for protons and neutrons we use the latest available data. For all form factors the uncertainties and correlations of form factor parameters are investigated with the $χ^2$ method.

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