低Q2下的质子自旋结构函数的精确测量

This project intends to take advantage of high-quality electron beam at Jefferson Laboratory with the high degree of polarized proton target (NH3) and the Hall A high-performancedetection system. The scattering cross section asymmetry of inclusive process is to be measured with different polarized status electron beam on proton target at different energy. Then we can obtain the proton spin structure function and thus the generalized forward spin polarizability. .We can also obtain the longitudinal - transverse spin polarization and higher order matrix element to abundant proton spin structure function of the experimental data. Then the understanding of nuclear high-twist effect will be better. It can be a test for the BC sum rules andchiral perturbation theory at the same time.

)：本项目拟利用美国Jefferson 实验室的高品质电子束，高极化度的质子靶（NH3）和A 大厅的高性能探测系统，通过不同能量下的不同极化状态的极化电子束在质子靶上的散射实验，单举测量低四动量转移下的散射截面不对称性，得到质子自旋结构函数、进而得到广义的前向自旋极化率、纵向-横向自旋极化率及高阶矩阵元，丰富质子自旋结构函数研究的实验数据，了解核子的高扭度效应，进一步检验B-C 求和规则和手征微扰理论。

本项目利用美国Jefferson 实验室的高品质电子束，高极化度的质子靶（NH3）和A 大厅的高性能探测系统，通过不同能量下的不同极化状态的极化电子束在质子靶上的散射实验，得到了单举测量低四动量转移下的散射截面不对称性以及从物理模型中得到的非极化散射截面，进而得到了质子的g1和g2原始结果。发表文章9篇，其中SCI收录5篇。