2020/06/30 by T. Hu, Z. Akbar, V. Credé +157
Physics and Astronomy · #Energy (signal processing) #Meson #Nuclear physics #Nuclear physics research studies #Nucleon #Omega #Particle physics #Particle physics theoretical and experimental studies #Photon #Photon energy #Physics #Proton #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #hep-ex #nucl-ex
paper · pdf · doi:10.1103/physrevc.102.065203
published as Phys. Rev. C 102, 065203 (2020) · 24 pages, 22 figures
openalex created_date 2020/06/12 · arxiv created 2020/12/10 · openalex publication_date 2020/12/14 · arxiv updated 2021/01/04 · openalex updated_date 2026/08/05
Photoproduction cross sections are reported for the reaction \ensuremathγp\ensuremath→p\ensuremathη using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The \ensuremathη mesons are detected in their dominant charged decay mode, \ensuremathη\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath-\ensuremathπ0, and results on differential cross sections are presented for incident photon energies between 1.2 and 4.7 GeV. These new \ensuremathη 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 \ensuremathη-MAID 2018 and the latest solution of the Bonn-Gatchina coupled-channel analysis. Differential cross sections d\ensuremathσ/dt are presented for incident photon energies E_\ensuremathγ>2.9\phantom\rule0.16em0exGeV (W>2.5\phantom\rule0.16em0exGeV), and compared with predictions which are based on Regge trajectories exchange in the t-channel (Regge models). The data confirm the expected dominance of \ensuremathρ, \ensuremathω vector-meson exchange in an analysis by the Joint Physics Analysis Center.