色偶极子模型中深度虚康普顿散射过程研究  

Deeply virtual compton scattering process under the color dipole model

作　　者：向文昌 蔡燕兵 周代翠[2] XIANG Wenchang;CAI Yanbing;ZHOU Daicui(Key Laboratory of Econophysics,Guizhou University of Finance and Economics,Guiyang 550025,China;Institute of Particle Physics,Central China Normal University,Wuhan 430079,China)

机构地区：[1]贵州财经大学金融物理重点实验室,贵州贵阳550025 [2]华中师范大学粒子物理研究所,湖北武汉430079

出　　处：《浙江大学学报（理学版）》2022年第6期706-714,共9页Journal of Zhejiang University（Science Edition）

基　　金：国家自然科学基金资助项目(12165004);贵州省教育厅滚动支持省属高校科研平台团队项目(黔教技[2022]016号)。

摘　　要：在色偶极子模型框架下,首次将共线改进的偶极子散射振幅用于研究深度虚康普顿散射(deeply virtual compton scattering,DVCS)过程实光子的产生。首先,利用计算机程序求解微积分形式的共线改进偶极子演化方程,用数值方法求得偶极子散射振幅的解。其次,将共线改进的偶极子散射振幅用于拟合HERA能区DVCS过程实光子产生的实验数据,通过拟合得到微分截面下的χ^(2)/d.o.f=0.51和总截面下的χ^(2)/d.o.f=0.89。最后,利用微分截面分布的理论值,基于dσ/d|t|∝e抽取了DVCS过程的斜率,所得结果与HERA能区H1实验组测量结果一致。结果表明,共线改进的偶极子散射振幅能很好地描述DVCS实验数据。Under the framework of color dipole model,the collinear improved dipole amplitude is applied,for the first time,to study the real photon production in deeply virtual compton scattering (DVCS) processes.Firstly,the numerical solution of the dipole scattering amplitudes are obtained by solving the integro-differential collinear improved dipole evolution equations.The collinear improved dipole scattering amplitudes are then used to fit the real photon production experimental data in DVCS processes at HERA energy.The fitting results areχ^(2)/d.o.f=0.51 for differential cross sections and χ^(2)/d.o.f=0.89 for total cross sections,respectively.Finally,using the theoretical results from the differential cross section distributions,the slope values in DVCS processes are extracted based on dσ/d|t|∝eformula.The corresponding results are consistent with the experimental measurements in H1 collaboration at HERA,indicating that the collinear improved dipole amplitude can give a good description for the DVCS experimental data.

关 键 词：深度虚康普顿散射(DVCS) 胶子饱和物理 遍举衍射过程 

分 类 号：O572.3[理学—粒子物理与原子核物理]