We determine the root-mean-square proton charge radius, $R_{\rm p}$, from afit to low-$Q^2$ electron-proton elastic scattering cross section data with thehigher moments fixed (within uncertainties) to the values predicted by chiralperturbation theory. We obtain $R_{\rm p}=0.857(11)$ fm. This number fallsbetween the value obtained from muonic hydrogen analyses and the CODATA value(based upon atomic hydrogen spectroscopy and electron-proton scatteringdeterminations).
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机译：我们确定了均方根质子电荷半径$ R _ {\ rm p} $，从较高的矩（在不确定性范围内）固定为该值到较低的$ Q ^ 2 $电子质子弹性散射截面数据由手性摄动理论预测。我们获得$ R _ {\ rm p} = 0.857（11）$ fm。该数值介于通过离子氢分析获得的值和CODATA值（基于原子氢光谱和电子质子散射测定）之间。
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