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Tree-level NLO corrections to inclusive ψ′ production in high energy factorization

A. A. Prokhorov1, S. P. Baranov2, A. V. Lipatov3, M. A. Malyshev3,4, and X. Chen5,6

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Phys. Rev. D 112, 114022 – Published 15 December, 2025

DOI: https://doi.org/10.1103/454q-673t

Abstract

We consider inclusive ψ(2S) production in proton-proton collisions at collider energies in the framework of nonrelativistic QCD and high energy factorization beyond the low-order approximation. We utilize a matching scheme proposed earlier to merge the leading-order and tree-level next-to-leading-order (NLO) production amplitudes and now extend it to low transverse momenta and/or forward rapidities. With the improved scheme, we examine the possibility to simultaneously describe all unpolarized LHC data in the full kinematic range accessible to experimental measurements and try different transverse momentum-dependent gluon distributions in the proton. A global fit to the data is carried out to extract the color octet long-distance matrix elements for ψ(2S) mesons. We show that taking the NLO corrections into account leads to a better description of the data.

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Phys. Rev. D 112, 114022– Published 15 December, 2025
  • Received 12 September 2025
  • Accepted 26 November 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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