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A method to include exclusive heavy vector-meson production data at small $x$ in global parton analyses

Year: 2024
Type: preprint
Abstract: We propose a method which allows the inclusion of exclusive heavy vector-meson production data at low $x$ in future global parton analyses. As an example we perform a study within xFitter to determine the gluon parton distribution function (PDF) at next-to-leading order (NLO) at moderate-to-low $x$ using the measurements of exclusive $J/ψ$ production in ep and pp collisions from HERA and LHC. We further study the constraints from the corresponding $Υ$ production process. We finish by discussing the possible effects at next-to-next-to-leading order (NNLO) through incorporation of a K factor for the exclusive heavy vector-meson coefficient function at NLO.
DOI: 10.48550/arxiv.2408.01128
Authors: Flett, C. A., Martin, A. D., Ryskin, M. G., Teubner, T.
Institutions: Centre National de la Recherche Scientifique, Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, Durham University, Kurchatov Institute, Petersburg Nuclear Physics Institute, University of Liverpool
Language: English
Open Access status: green
OpenAlex ID: W6891872018
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