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  • Letter
  • Open Access

NRQCD reconfronts LHCb data on quarkonium production within jets

Yunlu Wang1,*, Daekyoung Kang1,2,†, and Hee Sok Chung3,2,‡

  • *Contact author: yunluwang20@fudan.edu.cn
  • †Contact author: kang@fudan.edu.cn
  • ‡Contact author: heesokchung@gwnu.ac.kr
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Phys. Rev. D 112, L071504 – Published 29 October, 2025

DOI: https://doi.org/10.1103/24js-gqmg

Abstract

We compare LHCb measurements of J/ψ and ψ(2S) transverse-momentum distributions within jets with QCD calculations, which may be crucial in understanding the quarkonium production mechanism. Our theoretical calculations are based on the fragmenting jet function formalism, while the nonperturbative formation of quarkonia is described by the nonrelativistic QCD factorization formalism. We include the newest refinements in the perturbative calculation including resummation of threshold and Dokshitzer-Gribov-Lipatov-Altarelli-Parisi logarithms. We find that the ψ(2S) data have the potential to discriminate between the different production mechanisms proposed in the literature.

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Phys. Rev. D 112, L071504– Published 29 October, 2025
  • Received 1 August 2025
  • Accepted 2 October 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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