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Near-threshold photoproduction of $J/psi$ in two-gluon exchange model | | Fancong Zeng
; Xiao-Yun Wang
; Li Zhang
; Ya-Ping Xie
; Rong Wang
; Xurong Chen
; | | Date: |
31 Aug 2020 | | Abstract: | The near-threshold photoproduction of $J/psi$ 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 $x$ ($>0.1$). 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 $J/psi$ mass scale.
Moreover, we predict the differential cross section of the electroproduction of
$J/psi$ 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, thousands of $J/psi$ events can be detected per
year on EicC near the threshold. Therefore, the relevant experimental
measurements are suggested to be carried out on EicC. | | Source: | arXiv, 2008.13439 | | Services: | Forum | Review | PDF | Favorites | |
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