Work

J/ψ photoproduction: Threshold to very high energy

Year: 2024

Type: article

Abstract: A reaction model for γ + p → J / ψ + p photoproduction, which exposes the c c ¯ content of the photon in making the transition γ → c c ¯ + P → J / ψ and couples the intermediate c c ¯ system to the proton's valence quarks via Pomeron ( P ) exchange, is used to deliver a description of available data, viz . both differential and total cross sections from near threshold, where data has newly been acquired, to invariant mass W ≈ 300 GeV. The study suggests that it is premature to link existing γ + p → J / ψ + p data with, for instance, in-proton gluon distributions, the quantum chromodynamics trace anomaly, or pentaquark production. Further developments in reaction theory and higher precision data are necessary before the validity of any such connections can be assessed.

Source: Physics Letters B

DOI: 10.1016/j.physletb.2024.138904

Authors: Lin Tang, Yi-Xuan Yang, Zhu-Fang Cui, Craig D. Roberts

Institution: Nanjing University

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: National Natural Science Foundation of China, Government of Jiangsu Province, Natural Science Foundation of Jiangsu Province

Awards: G6317349381, G7320092610, G7705497243