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

P. Roy et al. (The CLAS Collaboration)
Phys. Rev. C 97, 055202 – Published 4 May 2018
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Abstract

The photoproduction of ω mesons off the proton has been studied in the reaction γppω 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 ωπ+ππ0, 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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  • Received 8 December 2017

DOI:https://doi.org/10.1103/PhysRevC.97.055202

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 97, Iss. 5 — May 2018

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