Backward-angle electroproduction of η' mesons off protons at W=2.13~GeV and Q²=0.46~(GeV/c)²

2025/11/21 by Akiyama, T., Bydžovský, P., Gogami, T. +83
#FOS: Physical sciences #Nuclear Experiment (nucl-ex)

paper · doi:10.48550/arxiv.2511.17030

Abstract

The electroproduction of η' mesons from a \mathrm¹H target at W=2.13~GeV, Q² = 0.46~( GeV/c)² and cos θ^CM_γ^*η' ≈ -1 has been experimentally measured. The differential cross section of virtual-photoproduction has been obtained as 4.4 ± 0.8 ~( stat. ) ± 0.4 ~( sys. )~ nb/sr in the One-Photon-Exchange Approximation. This value is one-sixth of that of real-photoproduction at backward angles. A comparison with newly-developed isobar model calculations not only shows validity of the theoretical framewark employed, but also imposes new constrains on coupling strength between the η'p final state and nucleon resonances.

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