The role of the soft scale for J/ψ production in the transverse momentum dependent framework

2025/09/03 by Marston Copeland, Copeland, Marston, Sean Fleming +3 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2509.02977

openalex publication_date 2025/09/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We use vNRQCD to study power corrections in the \rm v expansion due to soft gluon radiation during J/ψ production at small transverse momentum. We categorize four new J/ψ production operators that mediate the transition of perturbatively produced color-octet charm quark/anti-quark pairs to charm quarks in a ³S₁^[1] state via soft gluon emission. We then use Soft Collinear Effective Theory and vNRQCD to derive a factorization theorem for J/ψ production in SIDIS in terms of the gluon transverse momentum dependent (TMD) PDFs in the proton and new objects which we call TMD soft transition functions. We show that the TMD soft transition function leads in the \rm v power-counting with respect to the color-octet TMD shape functions that have been used in previous studies of J/ψ production at small transverse momentum.

Citations

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Cited by

• Modeling the TMD shape function in J/ψ electroproduction

Related

• Production of S-wave charmonia in the soft gluon resummation approach using the NRQCD
• J/ψ meson production in SIDIS: matching high and low transverse momentum
• The impact of the TMD shape function on matching the transverse momentum spectrum in J/ψ production at the EIC
• Charmonium production in the TMD factorization using the Improved Color Evaporation Model
• Factorization for J/ψ leptoproduction at small transverse momentum