共线改进的色玻璃凝聚理论中矢量介子产生研究

将利用共线改进的并以靶快度作为演化变量的偶极子散射振幅研究高能电子－质子散射中矢量介子的产生.研究中首先采用数值方法求解描述偶极子靶快度演化的微分积分方程，得到数值形式的偶极子散射振幅；然后，把该散射振幅放入矢量介子产生的微分截面中，用于拟合HERA实验数据.为了比较，分别采用了领头阶和共线改进的次领头阶偶极子散射振幅拟合J/ψ和两种矢量介子的实验数据，通过拟合分别得到在领头阶的情况下χ2/d.o.f＝1.485(J/ψ)、χ2/d.o.f＝1.696()和共线改进的情况下χ2/d.o.f＝0.996(J/ψ)、χ2/d.o.f＝1.089().研究结果表明共线改进的以靶快度作为演化变量的偶极子散射振幅能更好的描述实验数据.

Vector meson production in collinear improved color glass condensate

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.