The differential cross section for virtual photoproduction of η' mesons off protons at backward angles is measured as 4.4 ± 0.8 (stat.) ± 0.4 (sys.) nb/sr, one-sixth the real-photoproduction value, constraining η'p-nucleon resonance couplings.
Gell-Mann, Phys
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Backward-angle electroproduction of $\eta'$ mesons off protons at $W=2.13~\text{GeV}$ and $Q^{2}=0.46~\left(\text{GeV}/c\right)^{2}$
The differential cross section for virtual photoproduction of η' mesons off protons at backward angles is measured as 4.4 ± 0.8 (stat.) ± 0.4 (sys.) nb/sr, one-sixth the real-photoproduction value, constraining η'p-nucleon resonance couplings.