A1 Journal article (refereed)
Predictions for exclusive Υ photoproduction in ultraperipheral Pb+Pb collisions at the LHC at next-to-leading order in perturbative QCD (2023)

Eskola, K. J., Flett, C. A., Guzey, V., Löytäinen, T., & Paukkunen, H. (2023). Predictions for exclusive Υ photoproduction in ultraperipheral Pb+Pb collisions at the LHC at next-to-leading order in perturbative QCD. European Physical Journal C, 83(8), Article 758. https://doi.org/10.1140/epjc/s10052-023-11927-8

JYU authors or editors

Publication details

All authors or editors: Eskola, Kari J.; Flett, Christopher A.; Guzey, Vadim; Löytäinen, Topi; Paukkunen, Hannu

Journal or series: European Physical Journal C

ISSN: 1434-6044

eISSN: 1434-6052

Publication year: 2023

Publication date: 29/08/2023

Volume: 83

Issue number: 8

Article number: 758

Publisher: Springer

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1140/epjc/s10052-023-11927-8

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/88891

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2303.03007

Abstract

We present predictions for the rapidity-differential cross sections of exclusive Υ photoproduction in ultraperipheral collisions (UPCs) of lead ions at the Large Hadron Collider (LHC). We work in the framework of collinear factorization at next-to-leading order (NLO) in perturbative QCD, modeling the generalized parton distributions (GPDs) through the Shuvaev transform of nuclear parton distribution functions (nPDFs). Our direct NLO predictions depend significantly on nPDF uncertainties and on the choices of the factorization and renormalization scales, but to a much lesser degree on GPD modeling. To tame the scale dependence and to account for the fact that the NLO calculations generally underpredict the photoproduction measurements on protons, we also present alternative, data-driven predictions. In this approach the underlying photoproduction cross sections on lead are found by combining their nuclear modifications calculated at NLO with the measured photoproduction cross sections on protons. The data-driven strategy reduces the uncertainties associated with the scale choices, and essentially eliminates the effects of GPD modeling thereby leaving the cross sections sensitive mainly to the input nPDFs. Our estimates indicate that the process is measurable in Pb+Pb collisions at the LHC.

Keywords: particle physics; quantum chromodynamics

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Ministry reporting: Yes

VIRTA submission year: 2023

JUFO rating: 2