Exclusive heavy vector meson photoproduction on nuclei in NLO perturbative QCD

Autor:	Eskola, K. J., Guzey, V., Löytäinen, T., Paukkunen, H., Flett, C. A.
Rok vydání:	2023
Předmět:	High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment
Druh dokumentu:	Working Paper
Popis:	We make predictions for the cross section of coherent $J/\psi$ photoproduction in Pb-Pb and O-O ultraperipheral collisions (UPCs) at the LHC as a function of the $J/\psi$ rapidity $y$ in the framework of collinear factorization and next-to-leading order (NLO) perturbative QCD. We quantify the strong scale dependence and significant uncertainties due to nuclear PDFs and show that our approach provides a reasonable description of the LHC data on coherent $J/\psi$ photoproduction in Pb-Pb UPCs. We demonstrate that these uncertainties are reduced by approximately a factor of 10 in the scaled ratio of the O-O and Pb-Pb UPC cross sections. Our analysis indicates the dominance of the quark contribution to the UPC cross section at central rapidities, which affects the interpretation of the UPC data. Comment: 10 pages, 6 figures. Contribution to Proceedings of XXIX Cracow EPIPHANY Conference on Physics at the Electron-Ion Collider and Future Facilities, Cracow, Poland, January 16-19, 2023
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2303.12630 Zobrazit plný text záznamu View this record from Arxiv