rho-Meson Nucleon Scattering Length from CLAS Threshold Photoproduction Measurements

2025/09/04 by Strakovsky, Igor I., Isupov, Evgeny L., Mokeev, Victor +1 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th)

paper · doi:10.48550/arxiv.2509.04672

Abstract

Extending our study of the vector meson-nucleon scattering lengths (summary is given in Ref.~\citeStrakovsky:2021vyk), we are focusing on the ρ-meson case using recent CLAS threshold data for the reaction γp → ρp within the meson-baryon reaction model~\citeCLAS:2018drk. The total σ_t(γp→ ρp) and σ_t(γp→ ωp) cross sections are close below the momentum of the vector meson in CM q = 0.2~GeV/c. Then the ρp photoproduction cross section grows rapidly. Our result for ρN scattering length is a factor of 4 smaller than the size of the hadron and the phenomenological determination of the ω nucleon scattering length using threshold photoproduction cross sections. The observed difference between ρN and ωN scattering lengths is of interest for further understanding within the hadron structure theory.

Citations

• The reaction πN → ωN in a dynamical coupled-channel approach

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• Exclusive photoproduction of light and heavy vector mesons: thresholds to very high energies

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