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arXiv · 2511.17030

Backward-angle electroproduction of $\eta'$ mesons off protons at $W=2.13~\text{GeV}$ and $Q^{2}=0.46~\left(\text{GeV}/c\right)^{2}$

T. Akiyama·P. Bydžovský·T. Gogami·K. Itabashi·S. Nagao·S. N. Nakamura·K. Okuyama·B. Pandey·D. Skoupil·K. N. Suzuki·L. Tang·D. Abrams·D. Androic·K. Aniol·C. Ayerbe Gayoso·J. Bane·S. Barcus·J. Barrow·V. Bellini·H. Bhatt·D. Bhetuwal·D. Biswas·A. Camsonne·J. Castellanos·J-P. Chen·J. Chen·S. Covrig·D. Chrisman·R. Cruz-Torres·R. Das·E. Fuchey·K. Gnanvo·F. Garibaldi·T. Gautam·J. Gomez·P. Gueye·T. J. Hague·O. Hansen·W. Henry·F. Hauenstein·D. W. Higinbotham·C. E. Hyde·M. Kaneta·C. Keppel·T. Kutz·N. Lashley-Colthirst·S. Li·H. Liu·J. Mammei·P. Markowitz·R. E. McClellan·F. Meddi·D. Meekins·R. Michaels·M. Mihovilovič·A. Moyer·D. Nguyen·M. Nycz·V. Owen·C. Palatchi·S. Park·T. Petkovic·S. Premathilake·P. E. Reimer·J. Reinhold·S. Riordan·V. Rodriguez·C. Samanta·S. N. Santiesteban·B. Sawatzky·S. Širca·K. Slifer·T. Su·Y. Tian·Y. Toyama·D. Trnková·K. Uehara·G. M. Urciuoli·D. Votaw·J. Williamson·B. Wojtsekhowski·S. A. Wood·B. Yale·Z. Ye·J. Zhang·X. Zheng
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Abstract

The electroproduction of $\eta '$ mesons from a $\mathrm{^{1}H}$ target at $W=2.13~\text{GeV}$, $Q^{2} = 0.46~\left( \text{GeV}/c\right)^{2}$ and $\cos \theta^{\text{CM}}_{\gamma^{*}\eta'} \approx -1$ has been experimentally measured. The differential cross section of virtual-photoproduction has been obtained as $4.4 \pm 0.8 ~\left( \text{stat.} \right) \pm 0.4 ~\left( \text{sys.} \right)~ \text{nb/sr}$ 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 $\eta'p$ final state and nucleon resonances.

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T. Akiyama, P. Bydžovský, T. Gogami, K. Itabashi, S. Nagao, S. N. Nakamura, K. Okuyama, B. Pandey, D. Skoupil, K. N. Suzuki, L. Tang, D. Abrams, D. Androic, K. Aniol, C. Ayerbe Gayoso, J. Bane, S. Barcus, J. Barrow, V. Bellini, H. Bhatt, D. Bhetuwal, D. Biswas, A. Camsonne, J. Castellanos, J-P. Chen, J. Chen, S. Covrig, D. Chrisman, R. Cruz-Torres, R. Das, E. Fuchey, K. Gnanvo, F. Garibaldi, T. Gautam, J. Gomez, P. Gueye, T. J. Hague, O. Hansen, W. Henry, F. Hauenstein, D. W. Higinbotham, C. E. Hyde, M. Kaneta, C. Keppel, T. Kutz, N. Lashley-Colthirst, S. Li, H. Liu, J. Mammei, P. Markowitz, R. E. McClellan, F. Meddi, D. Meekins, R. Michaels, M. Mihovilovič, A. Moyer, D. Nguyen, M. Nycz, V. Owen, C. Palatchi, S. Park, T. Petkovic, S. Premathilake, P. E. Reimer, J. Reinhold, S. Riordan, V. Rodriguez, C. Samanta, S. N. Santiesteban, B. Sawatzky, S. Širca, K. Slifer, T. Su, Y. Tian, Y. Toyama, D. Trnková, K. Uehara, G. M. Urciuoli, D. Votaw, J. Williamson, B. Wojtsekhowski, S. A. Wood, B. Yale, Z. Ye, J. Zhang, X. Zheng. 2025-11-21. Backward-angle electroproduction of $\eta'$ mesons off protons at $W=2.13~\text{GeV}$ and $Q^{2}=0.46~\left(\text{GeV}/c\right)^{2}$. https://doi.org/10.1093/ptep%2Fptag049

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