XIANG Wenchang1， WANG Mengliang1， CAI Yanbing1， ZHOU Daicui2
(1.Key Laboratory of Econophysics， Guizhou University of Finance and Economics， Guiyang 550025， China；2.Institute of Particle Physics， Central China Normal University， Wuhan 430079， China)
Abstract：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 χ2/d.o.f＝1.171 and C2＝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.
2022, Vol. 56 
