The photoproduction of omega mesons off the proton has been studied in the reaction γp -> pω using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the decay ω -> π+π-π0, using a transversely polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant nonzero values are observed for these asymmetries, reaching about 30-40% in the third-resonance region. New measurements for the photon-beam asymmetry Σ are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional ω photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from s-channel resonance production were found in addition to t-channel exchange processes.
Copyright © 2018 American Physical Society. This article first appeared in Physical Review C 97, no. 5 (May 4, 2018): 055202:1-14. doi: 10.1103/PhysRevC.97.055202.
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Roy, P., Z. Akbar, S. Park, V. Crede, A. V. Anisovich, I. Denisenko, E. Klempt, G. Gilfoyle, et al. “Measurement of the Beam Asymmetry Sigma and the Target Asymmetry T in the Photoproduction of Omega Mesons off the Proton Using CLAS at Jefferson Laboratory.” Physical Review C 97, no. 5 (May 4, 2018): 055202. https://doi.org/10.1103/PhysRevC.97.055202.