https://doi.org/10.1140/epjc/s10052-020-08584-6
Regular Article – Theoretical Physics
Near-threshold photoproduction of 
in two-gluon exchange model
1
Lanzhou University of Technology, 730050, Lanzhou, China
2
Department of Physics, Lanzhou University of Technology, 730050, Lanzhou, China
3
Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
4
University of Chinese Academy of Sciences, 100049, Beijing, China
5
Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, 510006, Guangzhou, China
Received:
2
September
2020
Accepted:
19
October
2020
Published online:
6
November
2020
The near-threshold photoproduction of is regarded as one golden process to unveil the nucleon mass structure, pentaquark state involving the charm quarks, and the poorly constrained gluon distribution of the nucleon at large x (
). In this paper, we present an analysis of the current experimental data under a two-gluon exchange model, which shows a good consistency. Using a parameterized function form with three free parameters, we have determined the nucleonic gluon distribution at the mass scale. Moreover, we predict the differential cross-section of the electroproduction of as a function of the invariant mass of the final hadrons W, at EicC, as a practical application of the model and the obtained gluon distribution. According to our estimation, hundreds of events can be detected per year on EicC near the threshold. Therefore, the relevant experimental measurements are suggested to be carried out on EicC.
© The Author(s) 2020
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