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  • Letter
  • Open Access

J/ψ production in proton-proton collisions at Spin Physics Detector energies of the JINR Nuclotron-based Ion Collider fAcility

Shubham Sharma1,* and Alexey Aparin1,2,3,†

  • *Contact author: s.sharma.hep@gmail.com
  • †Contact author: aparin@jinr.ru
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Phys. Rev. C 113, L022201 – Published 19 February, 2026

DOI: https://doi.org/10.1103/xj4d-yqn7

Abstract

We investigate inclusive J/ψ production in proton-proton collisions at tens of GeV s energy, relevant for forthcoming measurements with the Spin Physics Detector (SPD) at NICA. Simulations are performed using the PEGASUS event generator with transverse-momentum-dependent (TMD) gluon densities, comparing the recent KMR-based KL′2025 and CCFM-based LLM′2024 parametrizations. Differential cross sections in rapidity and transverse momentum exhibit smooth, stable behavior under renormalization-scale variation. Normalized pT spectra reveal distinct hardening patterns linked to the underlying gluon kT broadening in each model. The relative contributions of color-singlet and color-octet channels are also quantified, demonstrating the dominance of color-octet mechanisms in the SPD energy regime. These results provide the first detailed assessment of quarkonium production sensitivity to gluon TMDs near threshold, offering timely theoretical guidance for upcoming J/ψ measurements at SPD/NICA.

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Phys. Rev. C 113, L022201– Published 19 February, 2026
  • Received 6 November 2025
  • Accepted 23 January 2026
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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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