Volume 485 - The European Physical Society Conference on High Energy Physics (EPS-HEP2025) - T04 Recent developments heavy ion physics, both experimental and theoretical aspects
Impact of high-energy resummation and GPD evolution on exclusive heavy-quarkonium photoproduction at NLO
C.Β Flett
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Pre-published on: January 09, 2026
Published on: β€”
Abstract
In these proceedings, we introduce and discuss the infamous scale-stability problem of exclusive heavy-quarkonium photoproduction off protons in Collinear Factorisation (CF) at next-to-leading order (NLO) in the strong coupling 𝛼𝑠 . We confirm this issue and propose a resolution to the problem by resumming leading-logarithmic QCD corrections via High-Energy Factorisation (HEF) in the Doubly-Leading-Logarithmic Approximation (DLA), matched to CF. Our NLO CF βŠ• DLA HEF predictions show good agreement with HERA and LHC data and exhibit significantly reduced scale dependence compared to Born-level results. We assess the relative impact of uncertainties arising from different sources, including PDF choice, intrinsic PDF uncertainties and variations of the factorisation and renormalisation scales, and compare them with the corresponding experimental uncertainties. The results bear implications for the interpretation of experimental measurements at past, current, and future facilities, including HERA, the LHC, and the EIC.
DOI: https://doi.org/10.22323/1.485.0198
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