https://doi.org/10.1140/epjc/s10052-020-7845-6
Regular Article - Theoretical Physics
Estimation of 
production in ep process near threshold
1
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
2
University of Chinese Academy of Sciences, Beijing, 100049, China
* e-mail: rwang@impcas.ac.cn
Received:
15
February
2020
Accepted:
16
March
2020
Published online:
29
March
2020
The near-threshold photo-productions of heavy quarkonia are important ways to test the QCD-inspired models and to constrain the gluon distribution of nucleon in the large x region. Investigating the various models, we choose a photon–gluon fusion model and a pomeron exchange model for 
photo-production near threshold, emphasising on the explanation of the recent experimental measurement by GlueX at JLab. We find that these two models are not only valid in a wide range of the center-of-mass energy of 
and proton, but also can be generalized to describe the photo-production. Using these two models, we predict the electro-production cross-sections of at EicC to be 48 fb to 85 fb at the center-of-mass energy of 16.75 GeV.
© The Author(s), 2020
