High‐precision determination of the electric and magnetic form factors of the proton
High‐precision determination of the electric and magnetic form factors of the proton
复制标题
高精度测定质子的电和磁形状因子
DOI：
10.1063/1.3647361
复制
发表时间：
2011
期刊：
影响因子：
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通讯作者：
J. Bernauer
中科院分区：
文献类型：
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作者：
J. Bernauer
本文介绍了在美因茨微波加速器MAMI上进行的弹性电子-质子散射截面测量的新的精确结果。测量了大约1400个截面，负四动量转移的平方达到Q2 =（GeV/c）2，统计误差低于0.2%。质子的电和磁形状因子是通过将各种形状因子模型直接拟合到横截面来提取的。在π介子云的尺度上，形状因子显示出一些特征。电荷半径和磁半径被确定为Δ rE 2 rpost="π">| 1/2 = 0.879（5）统计。（4）系统。（2）模型（4）群fm和群rM 2| 1/2 = 0.777（13）统计。（9）系统。（5）模型（2）群fm。
New precise results of a measurement of the elastic electron‐proton scattering cross section performed at the Mainz Microtron MAMI are presented. About 1400 cross sections were measured with negative four‐momentum transfers squared up to Q2 = (GeV/c)2 with statistical errors below 0.2%. The electric and magnetic form factors of the proton were extracted by fits of a large variety of form factor models directly to the cross sections. The form factors show some features at the scale of the pion cloud. The charge and magnetic radii are determined to be 〈rE2 rpost="〉">|1/2 = 0.879(5)stat.(4)syst.(2)model(4)groupfm and 〈rM2|1/2 = 0.777(13)stat.(9)syst.(5)model(2)groupfm.