Physical Review C
055202-1 - 055202-14
he 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.
Original Publication Citation
Roy, P., Akbar, Z., Park, S., Crede, V., Anisovich, A. V., Denisenko, I., . . . Collaboration, C. (2018). 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. Physical Review C, 97(5), 055202-055201 - 055202-055214. doi:10.1103/PhysRevC.97.055202
Roy, P.; Adhikari, K. P.; Charles, G.; Gavalian, G.; Klein, A.; Mayer, M.; Prok, Y.; Torayev, B.; Zhang, J.; and Zhao, Z. W., "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" (2018). Physics Faculty Publications. 194.