论文标题
从电子散射数据中精确测定质子磁性半径
Precise determination of proton magnetic radius from electron scattering data
论文作者
论文摘要
我们从高精度电子 - 普罗希望弹性散射横截面数据中提取质子磁性半径。我们的理论框架结合了分散分析和手性有效田间理论，并实施了控制低$ q^2 $形式的动力学。它允许我们使用最多$ q^2 \ sim $ 0.5 GEV $^2 $来限制半径并克服经验拟合的困难和$ q^2 \ rightArrow 0 $ fucklolation。我们获得了磁性半径$ r_m^p $ = 0.850 $ \ pm $ 0.001（适合68％）$ \ pm $ 0.010（理论完整范围）FM明显不同，与从相同数据获得的早期结果明显不同，并且接近提取的电力半径$ r_e^p $^p $ = 0.842 $ \ pm $ 0.002 $ 0.002（fit）$ 0.010（$ 0.010）（$ 0.010）FM。
We extract the proton magnetic radius from the high-precision electron-proton elastic scattering cross section data. Our theoretical framework combines dispersion analysis and chiral effective field theory and implements the dynamics governing the shape of the low-$Q^2$ form factors. It allows us to use data up to $Q^2\sim$ 0.5 GeV$^2$ for constraining the radii and overcomes the difficulties of empirical fits and $Q^2 \rightarrow 0$ extrapolation. We obtain a magnetic radius $r_M^p$ = 0.850 $\pm$0.001 (fit 68%) $\pm$0.010 (theory full range) fm, significantly different from earlier results obtained from the same data, and close to the extracted electric radius $r_E^p$ = 0.842 $\pm$0.002 (fit) $\pm$0.010 (theory) fm.
