Exclusive photoproduction of vector meson at next-to-leading order from Color Glass Condensate

Abstract

The exclusive photoproduction of vector mesons ($J/\psi$ and $\varphi$) are investigated by taking into account the next-to-leading order corrections in the framework of Color Glass Condensate. We confront the next-to-leading order modified dipole amplitude with the HERA data finding good agreement. Our studies show that the ${\chi }^2/d.o.f$ from 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 differential cross section. The outcomes indicate that the higher-order corrections have a significant contribution 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 by using the same parameters obtained from HERA. We find that our model can also give a rather good description of the $J/\psi$ and $\varphi$ data in proton-proton collision at 7 TeV and 13 TeV at LHCb experiments.

13 pages, 7 figures and 5 tables

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• The $\cos 2\varphi$ azimuthal asymmetry in ${\rho }^0$ meson production in ultraperipheral heavy ion collisions
• An Analytical Solution of the Balitsky-Kovchegov Equation with the Homogeneous Balance Method
• Coulomb nuclear interference effect in dipion production in ultraperipheral heavy ion collisions
• Extended collinearly-improved Balitsky-Kovchegov evolution equation in target rapidity
• Analytic solution of Balitsky-Kovchegov equation with running coupling constant using homogeneous balance method
• Solution to the Sudakov suppressed Balitsky-Kovchegov equation and its application to the HERA data