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

Authors

P. Roy
K. P. Adhikari, Old Dominion University
G. Charles, Old Dominion University
G. Gavalian, Old Dominion University
A. Klein, Old Dominion UniversityFollow
M. Mayer, Old Dominion University
Y. Prok, Old Dominion UniversityFollow
B. Torayev, Old Dominion UniversityFollow
J. Zhang, Old Dominion University
Z. W. Zhao, Old Dominion University

Document Type

Article

Publication Date

2018

DOI

10.1103/PhysRevC.97.055202

Publication Title

Physical Review C

Volume

97

Issue

5

Pages

055202-1 - 055202-14

Abstract

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.

Comments

Article is open access under the terms of the Creative Commons Attribution license.

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

ORCID

0000-0002-1792-1872 (Torayev)

Repository Citation

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.
https://digitalcommons.odu.edu/physics_fac_pubs/194