Exclusive photoproduction of vector meson at next-to-leading order from color glass condensate |
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| Authors: | Yanbing Cai Wenchang Xiang Mengliang Wang Daicui Zhou |
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| Affiliation: | 1. Guizhou Key Laboratory in Physics and Related Areas, Guizhou University of Finance and Economics, Guiyang 550025, China2. Department of Physics, Guizhou University, Guiyang 550025, China3. Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China |
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| Abstract: | The exclusive photoproduction of vector mesons (begin{document}$J/psi$end{document}![]() ![]() and begin{document}$phi$end{document}![]() ![]() ) 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 begin{document}$chi^2/d.o.f$end{document}![]() ![]() 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 begin{document}$J/psi$end{document}![]() ![]() and begin{document}$phi$end{document}![]() ![]() data in proton-proton collisions at 7 TeV and 13 TeV in LHCb experiments. |
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| Keywords: | color glass condensate vector meson production exclusive processes |
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