Exclusive photoproduction of vector meson at next-to-leading order from color glass condensate

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2020,（7）
• 页码范围: 167-178
• 页数: 12页
• 语种: 英文
• DOI: 10.1088/1674-1137/44/7/074110

摘要

The exclusive photoproduction of vector mesons (J/Ψ and φ) is investigated by considering the next-to-leading order corrections in the framework of the color glass condensate.We compare the next-to-leading order modified dipole amplitude with the HERA data,finding a good agreement.Our studies show that the x2/d.o.f from the leading order,running coupling,and collinearly improved next-to-leading order dipole amplitudes are 2.159,1.097,and 0.932 for the elastic cross-section,and 2.056,1.449,and 1.357 for the differential cross-section,respectively.The results indicate that the higher-order corrections contribute significantly to the vector meson productions,and the description of the experimental data is dramatically improved once the higher order corrections are included.We extend the next-to-leading order exclusive vector meson production model to LHC energies using the same parameters obtained from HERA.We find that our model provides a rather good description of the J/Ψ and φ data in proton-proton collisions at 7 TeV and 13 TeV in LHCb experiments.