Threshold Upsilon-meson Photoproduction at EIC and EicC

Abstract

High-accuracy ${\rm Y}$-meson photoproduction data from EIC and EicC experiments will allow the measurement of the near-threshold total cross section of the reaction $\gamma p\to {\rm Y}p$, from which the absolute value of the ${\rm Y}p$ scattering length, $|{\alpha }_{{\rm Y}p}|$, can be extracted using a Vector-Meson Dominance model. For this evaluation, we used ${\rm Y}$-meson photoproduction quasi-data from the QCD approach (the production amplitude can be factorized in terms of gluonic generalized parton distributions and the quarkonium distribution amplitude). A comparative analysis of $|{\alpha }_{{\rm Y}p}|$ with the recently determined scattering lengths for $\omega p$, $\varphi p$, and $J/\psi p$ using the A2, CLAS, and GlueX experimental data are performed. The role of the "young" vector-meson effect is evaluated.

arXiv comment6 pages, 6 figures, 3 tables

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Cited by in corpus (7)

• The ${\psi }^{(\ast )}p$ scattering length based on near-threshold charmoniums photoproduction
• Extraction of Proton Trace Anomaly Energy from Near-Threshold $\varphi$ and $J/\psi$ photo-productions
• Proton and deuteron mass radii from near-threshold $\varphi$-meson photoproduction
• First extraction of the proton mass radius and scattering length $\left|{\alpha }_{{\rho }^{0}p}\right|$ from ${\rho }^0$ photoproduction
• Extraction of $\omega$n, $\omega$p and $\varphi$N scattering lengths from $\omega$ and $\varphi$ differential photoproduction cross sections on the deuterium target
• Vector meson-nucleon scattering length $|{\alpha }_{VN}|$ and trace anomalous energy contribution to the nucleon mass $T_A$
• Analysis of the interaction between $\varphi$ meson and nucleus