2021/08/31 by Rong Wang, Wei Kou, Chengdong Han +2
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1103/physrevd.104.074033
published as Phys. Rev. D 104, 074033 (2021) · 6 pages, 6 figures
arxiv created 2021/11/20 · arxiv updated 2021/11/23
We analyze the exclusive ϕ-meson photoproduction on both hydrogen and deuterium targets based on the published data of CLAS, SAPHIR and LEPS collaborations. A dipole-form scalar gravitational form factor is applied to describe the |t|-dependence of the differential cross section. Based on the average of all the near-threshold data from CLAS, SAPHIR and LEPS, we find that the proton and deuteron mass radii are 0.75 ± 0.02 fm and 1.95 ± 0.19 fm respectively. The coherent and near-threshold quarkonium photoproduction seems to be sensitive to the radius of the hadronic system. The vector-meson-dominance model together with a low-energy QCD theorem well describe the data of near-threshold ϕ photoproduction on the hadronic systems.