Abstract
We analyze the exclusive $\phi$-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 $0.75 \pm 0.02$ fm and $1.95 \pm 0.19$ 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 $\phi$ photoproduction on the hadronic systems.
Highlights
Hadronic matter accounts for most the mass of the visible universe
We analyze the exclusive φ-meson photoproduction on both hydrogen and deuterium targets based on the published data of CLAS, SAPHIR and LEPS collaborations
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 Æ 0.02 fm and 1.95 Æ 0.19 fm respectively
Summary
Hadronic matter accounts for most the mass of the visible universe. many mysteries remain concerning hadron structure, such as how the hadron mass, spin and pressure are fixed by strong interactions of the quarks and gluons inside [1,2,3,4,5,6,7,8,9,10]. Proton and deuteron mass radii from near-threshold φ-meson photoproduction 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 Æ 0.02 fm and 1.95 Æ 0.19 fm respectively.
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