Next-to-leading order analysis of J/ψ+ γ production in photon-photon collisions at CEPC

2025/11/21 by Jiang, Ying-Zhao, Sun, Zhan
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2511.16881

Abstract

We systematically investigate the production of J/ψ+ γ in γγ collisions at next-to-leading order in α_s within nonrelativistic QCD (NRQCD) factorization. Calculations for CEPC energy region show the resolved photon contribution is negligible, while the direct photon process dominates, yielding substantial annual J/ψ yields. Significant modifications to J/ψ polarization parameters emerge from color-octet mechanisms, and different NRQCD long distance matrix elements (LDMEs) further yield distinct polarization patterns. Furthermore, the polarization predictions are highly sensitive to the ³P_J^[8] LDME, while being insensitive to the ¹S₀^[8] and ³S₁^[8] LDMEs. Leveraging the cleaner environment of e⁺e^- collisions versus hadronic processes, the production of J/ψ associated with a photon in γγ collisions provides a high-precision platform to test LDMEs universality and resolve longstanding J/ψ polarization puzzles.

Citations

• How well does nonrelativistic QCD factorization work at next-to-leading order?
• Higher-order corrections to exclusive production of charmonia at B factories

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