Photoproduction cross sections are reported for the reaction $$\gamma p\to p\eta$$ using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The $$\eta$$ mesons are detected in their dominant charged decay mode, $$\eta\to \pi^+\pi^-\pi^0$$, and results on differential cross sections are presented for incident photon energies between 1.2 and 4.7 GeV. These new $$\eta$$ photoproduction data are consistent with earlier CLAS results but extend the energy range beyond the nucleon resonance region into the Regge regime. The normalized angular distributions are also compared with the experimental results from several other experiments, and with predictions of $$\eta$$ MAID\,2018 and the latest solution of the Bonn-Gatchina coupled-channel analysis. Differential cross sections $$d\sigma/dt$$ are presented for incident photon energies $$E_\gamma > 2.9$$ GeV ($W > 2.5$ GeV), and compared with predictions which are based on Regge trajectories exchange in the $$t$$-channel (Regge models). Overall, the data confirm the expected dominance of $$\rho$$, $$\omega$$ vector-meson exchange in an analysis by the Joint Physics Analysis Center.
Hu, T., et al. "Photoproduction of <em>η</em> mesons off the proton for 1.2 < <em>E<sub>γ</sub></em> < 4.7GeV using CLAS at Jefferson Laboratory." Physical Review C, vol. 102, no. 6, Dec. 2020. https://doi.org/10.1103/physrevc.102.065203
Hu, T., Akbar, Z., Crede, V., Adhikari, K. P., Adhikari, S., Amaryan, M. J., Angelini, G., Asryan, G., Atac, H., Ayerbe Gayoso, C., Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bossù, F., Boiarinov, S., ... Zhao, Z. W. (2020). Photoproduction of <em>η</em> mesons off the proton for 1.2 < <em>E<sub>γ</sub></em> < 4.7GeV using CLAS at Jefferson Laboratory. Physical Review C, 102(6). https://doi.org/10.1103/physrevc.102.065203
Hu, T., Akbar, Z., Crede, V., et al., "Photoproduction of <em>η</em> mesons off the proton for 1.2 < <em>E<sub>γ</sub></em> < 4.7GeV using CLAS at Jefferson Laboratory," Physical Review C 102, no. 6 (2020), https://doi.org/10.1103/physrevc.102.065203
@article{osti_1735831,
author = {Hu, T. and Akbar, Z. and Crede, V. and Adhikari, K. P. and Adhikari, S. and Amaryan, M. J. and Angelini, G. and Asryan, G. and Atac, H. and Ayerbe Gayoso, C. and others},
title = {Photoproduction of <em>η</em> mesons off the proton for 1.2 < <em>E<sub>γ</sub></em> < 4.7GeV using CLAS at Jefferson Laboratory},
annote = {Photoproduction cross sections are reported for the reaction $\gamma p\to p\eta$ using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The $\eta$ mesons are detected in their dominant charged decay mode, $\eta\to \pi^+\pi^-\pi^0$, and results on differential cross sections are presented for incident photon energies between 1.2 and 4.7 GeV. These new $\eta$ photoproduction data are consistent with earlier CLAS results but extend the energy range beyond the nucleon resonance region into the Regge regime. The normalized angular distributions are also compared with the experimental results from several other experiments, and with predictions of $\eta$ MAID\,2018 and the latest solution of the Bonn-Gatchina coupled-channel analysis. Differential cross sections $d\sigma/dt$ are presented for incident photon energies $E_\gamma > 2.9$ GeV ($W > 2.5$ GeV), and compared with predictions which are based on Regge trajectories exchange in the $t$-channel (Regge models). Overall, the data confirm the expected dominance of $\rho$, $\omega$ vector-meson exchange in an analysis by the Joint Physics Analysis Center.},
doi = {10.1103/physrevc.102.065203},
url = {https://www.osti.gov/biblio/1735831},
journal = {Physical Review C},
issn = {ISSN 2469-9985},
number = {6},
volume = {102},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2020},
month = {12}}
Argonne National Laboratory (ANL), Argonne, IL (United States); Mississippi State Univ., Mississippi State, MS (United States); Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Organization:
Centre National de la Recherche Scientifique (CNRS); Chilean Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); Commissariat a l’Energie Atomique (CEA); Instituto Nazionale di Fisica Nucleare (INFN); National Research Foundation (NRF) of Korea; National Science Foundation (NSF); Scottish Universities Physics Alliance (SUPA); USDOE Office of Science (SC), Nuclear Physics (NP); United Kingdom Science and Technology Facilities Council
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