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Measurement of the helicity asymmetry e in ω→π+π-π0 photoproduction
Akbar, Z Roy, P Park, S Crede, V Anisovich, AV Denisenko, I Klempt, E Nikonov, VA Sarantsev, AV Adhikari, KP
Akbar, Z
Roy, P
Park, S
Crede, V
Anisovich, AV
Denisenko, I
Klempt, E
Nikonov, VA
Sarantsev, AV
Adhikari, KP
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2017-12-28
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10.1103/PhysRevC.96.065209
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© 2017 American Physical Society. The double-polarization observable E was studied for the reaction γp→pω using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility and the longitudinally polarized frozen-spin target (FROST). The observable was measured from the charged decay mode of the meson, ω→π+π-π0, using a circularly polarized tagged-photon beam with energies ranging from the ω threshold at 1.1 to 2.3 GeV. A partial-wave analysis within the Bonn-Gatchina framework found dominant contributions from the 3/2+ partial wave near threshold, which is identified with the subthreshold N(1720)3/2+ nucleon resonance. To describe the entire data set, which consisted of ω differential cross sections and a large variety of polarization observables, further contributions from other nucleon resonances were found to be necessary. With respect to nonresonant mechanisms, π exchange in the t channel was found to remain small across the analyzed energy range, while Pomeron t-channel exchange gradually grew from the reaction threshold to dominate all other contributions above W≈2 GeV.
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Physical Review C
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