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Photoproduction of η mesons off the proton for 1.2<Eγ<4.7GeV using CLAS at Jefferson Laboratory

descriptionPublicationkeyboard_double_arrow_right Article , Preprint , Journal 14 Dec 2020 Italy, United States, France, United States, Italy, Germany, Germany, Italy Publisher:American Physical Society (APS)Journal:Physical Review C, volume 102 (issn: 2469-9985, eissn: 2469-9993,

Authors: K. A. Griffioen; F. X. Girod; F. X. Girod; Z. W. Zhao; Z. W. Zhao; T. Hu; M. E. McCracken; +164 Authors

doi: 10.1103/physrevc.102.065203

arXiv: 2006.01361 , http://arxiv.org/abs/2006.01361

handle: 11379/549856 , 2108/270536 , 11392/2432810

Photoproduction of η mesons off the proton for 1.2<Eγ<4.7GeV using CLAS at Jefferson Laboratory

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Abstract

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). The data confirm the expected dominance of $\rho$, $\omega$ vector-meson exchange in an analysis by the Joint Physics Analysis Center.

Comment: 24 pages, 22 figures

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Italy, United States, France, United States, Italy, Germany, Germany, Italy

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Keywords

Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni, Regge, eta --> pi+ pi- pi0, eta: photoproduction, Atomic, High Energy Physics - Experiment, Resonance reactions, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], angular distribution, info:eu-repo/classification/ddc/530, Nuclear Experiment, photoproduction [eta], Physics, Molecular and Optical Physics, photon: energy, coupled channel, eta: decay modes, Protons, Jefferson Lab, Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE, photon p --> p eta, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], decay modes [eta], Hadronic Physics and QCD, Regge poles: exchange, rho(770), nucleon resonance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 530, energy dependence, differential cross section: measured, measured [differential cross section], Photonuclear Reactions; QCD in Nuclear Reactions; Resonance Reactions; Light Mesons; Protons, CLAS, Nuclear, exchange [Regge poles], omega(783), Light mesons, energy [photon], Photonuclear reactions, 541, vector meson: exchange, QCD in nuclear reactions, spectrometer, exchange [vector meson], experimental results

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