Exclusive and dissociative J/ψ production with collinear-improved Balitsky-Kovchegov equation

作者：Zhang, Shiyi; Cai, Shaohong; Xiang, Wenchang^*; Cai, Yanbing; Zhou, Daicui

来源：Chinese Physics C, 2021, 45(7): 073110.

DOI：10.1088/1674-1137/abfbca

• vector meson production
• gluon saturation physics
• exclusive production
• dissociative production

We extend the hotspot model to include the virtuality dependence and use it to study the exclusive and dissociative J/psi production combined with the dipole amplitude in the target rapidity representation. We determined that virtuality takes effect on a number of hotspots, thus providing a better description of the J/psi production data at HERA. The collinear improved Balitsky-Kovchegove equation in the target rapidity representation is numerically solved and used to fit the J/psi experimental data with a series of hotspot sizes. We infer that virtuality significantly influences the number and size of hotspots. The expression chi(2)/d.o.f = 1.0183 resulting from the fit with the collinear improved dipole amplitude in the target rapidity representation is more reasonable than the corresponding chi(2)/d.o.f = 1.3995 originating from the leading order fit, which indicates that the collinear improved evolution equation in the target rapidity representation can provide a relatively good depiction of the exclusive and dissociative HERA data.

• 单位
  贵州大学