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arXiv 0911.4091hep-phnucl-th
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根据弹性$ep$散射数据计算质子电荷和磁均方根半径

Proton charge and magnetic rms radii from the elastic $ep$ scattering data

Dmitry Borisyuk

摘要:

本文分析了弹性电子-质子散射数据,以确定质子电荷和磁均方根半径r_E和r_M。除了通常的统计误差外,我们还试图估计半径中的系统误差,这是由所采用的特定形状因子参数化的不足引起的。选择分析中使用的数据范围,以尽量减少总(统计+系统)误差。我们得到r_E = 0.912 +-0.009(stat)+-0.007(syst)fm和r_M = 0.876 +-0.010(stat)+-0.016(syst)fm。对截面数据进行双光子交换校正。我们发现,如果不作这种修正,则r_E和r_M都要小一些,而拟合质量也要差一些。

英文摘要:

The elastic electron-proton scattering data are analysed in order to determine proton charge and magnetic rms radii, r_E and r_M. Along with the usual statistical error, we try to estimate a systematic error in the radii, caused by the inadequacy of particular form factor parameterization employed. The range of data to use in the analysis is chosen so as to minimize the total (statistical + systematic) error. We obtain r_E = 0.912 +- 0.009 (stat) +- 0.007 (syst) fm, and r_M = 0.876 +- 0.010 (stat) +- 0.016 (syst) fm. The cross-section data were corrected for two-photon exchange. We found that without such corrections obtained r_E and r_M are somewhat smaller while the quality of fit is worse.

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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