Puzzle for the Vector Meson Threshold Photoproduction
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912531116720128 |
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| author | Strakovsky, Igor |
| author_facet | Strakovsky, Igor |
| contents | High-statistics total cross sections for the vector meson photoproduction at the threshold: $γp\toωp$ (from A2 at MAMI, ELPH, and CBELSA/TAPS), $γp\to ϕp$ (from CLAS and LEPS), and $γp\to J/ψp$ (from GlueX) allow one to extract the absolute value of vector meson nucleon scattering length using Vector Meson Dominance (VMD) model. The ``young'' vector meson hypothesis may explain the fact that the obtained scattering length value for the nucleon $ϕ$-meson compared to the typical hadron size of approximately $\sim1~\mathrm{fm}$ indicates that the proton is more transparent for the $ϕ$-meson compared to the $ω$-meson and is much less transparent than the $J/ψ$-meson. The extended analysis of $Υ$-meson photoproduction using quasi-data from the QCD approach is in perfect agreement with the light-meson findings using experimental data.
Future high-quality experiments by EIC and EicC will have the opportunity to evaluate cases for $J/ψ$- and $Υ$-mesons. It allows one to understand the dynamics of $c\bar{c}$ and $b\bar{b}$ production at the threshold. The ability of J-PARC to measure $π^- p\to ϕn$ and $π^-p\to J/ψn$, which are free from the VMD model, is considered. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_07338 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Puzzle for the Vector Meson Threshold Photoproduction Strakovsky, Igor High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory High-statistics total cross sections for the vector meson photoproduction at the threshold: $γp\toωp$ (from A2 at MAMI, ELPH, and CBELSA/TAPS), $γp\to ϕp$ (from CLAS and LEPS), and $γp\to J/ψp$ (from GlueX) allow one to extract the absolute value of vector meson nucleon scattering length using Vector Meson Dominance (VMD) model. The ``young'' vector meson hypothesis may explain the fact that the obtained scattering length value for the nucleon $ϕ$-meson compared to the typical hadron size of approximately $\sim1~\mathrm{fm}$ indicates that the proton is more transparent for the $ϕ$-meson compared to the $ω$-meson and is much less transparent than the $J/ψ$-meson. The extended analysis of $Υ$-meson photoproduction using quasi-data from the QCD approach is in perfect agreement with the light-meson findings using experimental data. Future high-quality experiments by EIC and EicC will have the opportunity to evaluate cases for $J/ψ$- and $Υ$-mesons. It allows one to understand the dynamics of $c\bar{c}$ and $b\bar{b}$ production at the threshold. The ability of J-PARC to measure $π^- p\to ϕn$ and $π^-p\to J/ψn$, which are free from the VMD model, is considered. |
| title | Puzzle for the Vector Meson Threshold Photoproduction |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2508.07338 |