DOI
10.1103/PhysRevC.97.055202
Abstract
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.
Document Type
Article
Publication Date
5-4-2018
Publisher Statement
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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Recommended Citation
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.