Work

NNLL fit of the transverse-momentum-dependent distribution of unpolarised gluons to LHCb data on $J/ψ$-pair production

Year: 2026

Type: preprint

Abstract: We perform the first fit of the unpolarised gluon transverse-momentum-dependent distribution $f_1^g$ up to next-to-next-to-leading-logarithmic accuracy to the double-differential distribution in the invariant mass and transverse momentum of the latest $J/ψ$-pair production LHCb data. We review previous attempts to describe the older $J/ψ$-pair LHCb data using $f_1^g$, and discuss two novel methodologies which allow us to account in the fit for both the perturbative and PDF uncertainties to construct $f_1^g$ in the perturbative region. It turns out that the consideration of these uncertainties is crucial for a meaningful fit to such low-scale gluon-sensitive data.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.01000

Authors: Boer, D., Bor, J., Serri, A. C., Echevarria, M. G., Lansberg, J. P., Romera, S. F., Taels, P.

Institutions: University of Groningen, University of the Basque Country, Centre National de la Recherche Scientifique, Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, University of Antwerp

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Agence Nationale de la Recherche, Fonds Wetenschappelijk Onderzoek, Vlaamse regering

Award: Novel approach to the proton's 3D structure

OpenAlex ID: W7206169626

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