Vector meson production in collinear improved color glass condensate
XIANG Wenchang1， 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 collinear improved dipole amplitude in target rapidity representation is used to study the vector meson production in high energy electron-proton collisions. We firstly solve collinear improved evolution equation numerically， and obtain the numerical version of dipole amplitude which shall use in the calculation of the differential cross section of the vector meson production. Fitting the J/ψ and data with the leading order and collinear improved dipole amplitudes in order to make comparison， it is generated that χ2/d.o.f＝1.485(J/ψ)andχ2/d.o.f＝1.696() in the leading order case， and χ2/d.o.f＝0.996(J/ψ)andχ2/d.o.f＝1.089() in the collinear improved case， respectively. Our results show that the collinear improved dipole amplitude in target rapidity representation can describe the data better than the leading order one.
2021, Vol. 55 
