Electric and magnetic form factors of the proton
Electric and magnetic form factors of the proton
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DOI：
10.1103/physrevc.90.015206
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发表时间：
2014-07-29
影响因子：
3.1
通讯作者：
Weinriefer, M.
中科院分区：
文献类型：
--
作者：
Bernauer, J. C.;Distler, M. O.;Weinriefer, M.
本文描述了在动量转移小于或类似于Q(2)小于或类似于1 GeV2的0.003时质子的电子散射的精确测量。本实验中截面的平均点对点误差接近0.37%。这些数据与迄今为止测量到的从最小动量转移到最高动量转移的所有非极化和极化电子散射数据一起用于连贯的新分析。提取的电和磁形状因子提供了对其确切形状的新见解，偏离了经典的偶极子形式，以及在这种总体形状之上的结构。达到非常低的Q(2)值的数据用于电和磁半径的新测定。给出了双光子交换校正的经验测定方法。讨论了这种修正对半径的影响以及介子云直接可见信号的问题。
This paper describes a precise measurement of electron scattering off the proton at momentum transfers of 0.003 less than or similar to Q(2) less than or similar to 1 GeV2. The average point-to-point error of the cross sections in this experiment is similar to 0.37%. These data are used for a coherent new analysis together with all world data of unpolarized and polarized electron scattering from the very smallest to the highest momentum transfers so far measured. The extracted electric and magnetic form factors provide new insight into their exact shape, deviating from the classical dipole form, and of structure on top of this gross shape. The data reaching very low Q(2) values are used for a new determination of the electric and magnetic radii. An empirical determination of the two-photon-exchange correction is presented. The implications of this correction on the radii and the question of a directly visible signal of the pion cloud are addressed.