A proposed μCLAS12 upgrade at CLAS12 targets di-muon production to access the complete phase space of nucleon Generalized Parton Distributions via Double Deeply Virtual Compton Scattering.
Measurement of the near-threshold J/ψphotoproduction cross section with the CLAS12 experiment
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abstract
We present measurements of the total and differential cross sections for near-threshold J/$\psi$ photoproduction obtained with the CLAS12 detector at the Thomas Jefferson National Accelerator Facility. The results are based on data collected during the Fall 2018 and Spring 2019 running periods, using electron beams with energies of 10.6 and 10.2 GeV, respectively, scattered off a liquid-hydrogen target. Near-threshold J$/\psi$ photoproduction offers a unique sensitivity to the strong interaction in the non-perturbative regime of Quantum Chromodynamics (QCD). The energy dependence of the cross section constrains the underlying J$/\psi$ production mechanisms, including multi-gluon exchange and potential baryonic excitations. Additionally, the $t$-dependence of the differential cross section can be related to the transverse spatial distribution of gluons in the proton, providing critical input for theoretical descriptions of the gluonic structure of the proton. An interpretation of the results in terms of the gluon content of the proton is presented, providing new experimental constraints on QCD-inspired models of the proton structure and the role of gluonic degrees of freedom in hadronic mass generation.
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2026 6representative citing papers
Rescattering via open-charm channels in a tree-level effective Lagrangian model improves fits to near-threshold J/ψ photoproduction data and produces cusp structures at the relevant thresholds.
Hidden-charm pentaquarks do not appear in J/ψ photoproduction because rescattering from ar{D}^{(*)}Σ_c intermediate states is suppressed relative to ar{D}^{(*)}Λ_c by a factor of roughly five in the relevant couplings.
Incorporating recent JLab threshold measurements refines the J/ψ-proton scattering length and discusses nucleon form factor corrections plus potential pentaquark effects to be probed at J-PARC.
The study applies the two-gluon exchange model via STARlight to charmonium UPCs, finding that a fitted suppression factor brings PbPb predictions into agreement with data including the double-peak rapidity structure, while pPb shows no such need.
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Electro- and photoproduction of muon pairs with $\mu$CLAS12: Double Deeply Virtual Compton Scattering, Timelike Compton Scattering, and $J/\psi$ production
A proposed μCLAS12 upgrade at CLAS12 targets di-muon production to access the complete phase space of nucleon Generalized Parton Distributions via Double Deeply Virtual Compton Scattering.