色玻璃凝聚理论中跑动耦合常数效应研究  

Running coupling effect in color glass condensate

作　　者：向文昌 王梦亮 蔡燕兵 周代翠[2] XIANG Wenchang;WANG Mengliang;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,贵阳550025 [2]华中师范大学粒子物理研究所,武汉430079

出　　处：《华中师范大学学报（自然科学版）》2022年第4期585-593,共9页Journal of Central China Normal University：Natural Sciences

基　　金：贵州省省级科技计划项目(黔科合平台人才[2019]5103号)。

摘　　要：在色偶极子模型下,该文研究了4种跑动耦合常数方案对偶极子散射振幅演化的影响.通过数值解共线改进的Balitsky-Kovchegov演化方程,获得数值形式的偶极子散射振幅,结合光子波函数,对HERA能区光子-质子深度非弹性散射实验数据开展了拟合研究,结果显示4种方案中的Balitsky方案给出较合理的实验数据描述,χ^(2)/d.o.f=1.171且自由参数C^(2)=0.326接近其理论值,由此可知其为较优的方案.此外,为了显示次领头阶跑动耦合常数效应的重要性,该文还对同一组实验数据采用领头阶和共线改进的散射振幅进行了对比研究,结果显示无论4种跑动耦合常数方案中的拟合参数怎么变化,领头阶散射振幅都无法对相应数据进行合理描述,结果表明跑动耦合常数效应对压低偶极子的演化有着重要的作用.The influence of 4 types of running coupling prescriptions on the evolution of dipole amplitude was studied in the framework of color glass condensate. The photon-proton scattering data at HERA were fitted by using the numerical amplitude resulting from collinearly-improved Balitsky-Kovchegov equation. The fitting results showed that the Balitsky prescription gives a relatively good description of the data than others with χ^(2)/d.o.f=1.171 and C^(2)=0.326, which indicated that the Balitsky prescription would be a priority prescription among them. Moreover, the leading order and collinearly-improved scattering amplitudes were used to perform a comparison study with the same group data in order to find the importance of the running coupling effect. The outcomes suggested that the leading order amplitude wasn’t able to present a consistent description of the data by only adjusting the free parameters in the dipole model, which implied that the running coupling correction plays a significant role in suppression of the dipole evolution.

关 键 词：色玻璃凝聚 胶子饱和物理 跑动耦合常数 

分 类 号：O571[理学—粒子物理与原子核物理]