Inclusive J/ψ production in forward proton-proton and proton-lead collisions at high energy

2024/09/03 by Patricia Gimeno-Estivill, Gimeno-Estivill, Patricia, T. Lappi +3
Computer Science · Physics and Astronomy · #Advanced Data Storage Technologies #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies

paper · pdf · doi:10.48550/arxiv.2409.01791

openalex publication_date 2024/09/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04

Abstract

We calculate the cross section for forward J/ψ production in proton-proton and minimum bias proton-lead collisions using the Color Glass Condensate (CGC) and Non-Relativistic QCD (NRQCD) formalism consistently with Deep Inelastic Scattering data. The cross section for color singlet states is sensitive to a 4-point correlator of Wilson lines for which we describe in the Gaussian approximation in the large-N_c limit. Furthermore, we quantify the importance of finite-N_c corrections to have a small ∼ 12% effect. In contrast with the generic NRQCD expectation, we show that the color singlet contribution is only 15% to the total cross section. We also compare our predictions for J/ψ production as well as for the nuclear modification ratio R_pPb to LHCb and ALICE data. We find a good agreement at forward rapidities, except at low transverse momenta where the cross sections are overestimated.

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