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Measurement of the beam asymmetry Σ and the target asymmetry T in the photoproduction of ω mesons off the proton using CLAS at Jefferson Laboratory
Roy, P Akbar, Z Park, S Crede, V Anisovich, AV Denisenko, I Klempt, E Nikonov, VA Sarantsev, AV Adhikari, KP
Roy, P
Akbar, Z
Park, S
Crede, V
Anisovich, AV
Denisenko, I
Klempt, E
Nikonov, VA
Sarantsev, AV
Adhikari, KP
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2018-05-04
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10.1103/PhysRevC.97.055202
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© 2018 American Physical Society. The photoproduction of ω 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.
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Physical Review C
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