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arXiv · 2108.02871

Threshold Upsilon-meson Photoproduction at EIC and EicC

Igor I. Strakovsky·William J. Briscoe·Lubomir Pentchev·Axel Schmidt
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Abstract

High-accuracy $Υ$-meson photoproduction data from EIC and EicC experiments will allow the measurement of the near-threshold total cross section of the reaction $γp\toΥp$, from which the absolute value of the $Υp$ scattering length, $|α_{Υp}|$, can be extracted using a Vector-Meson Dominance model. For this evaluation, we used $Υ$-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 $|α_{Υp}|$ with the recently determined scattering lengths for $ωp$, $ϕp$, and $J/ψp$ using the A2, CLAS, and GlueX experimental data are performed. The role of the "young" vector-meson effect is evaluated.

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Igor I. Strakovsky, William J. Briscoe, Lubomir Pentchev, Axel Schmidt. 2021-08-05. Threshold Upsilon-meson Photoproduction at EIC and EicC. https://doi.org/10.1103/physrevd.104.074028

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