Measurement of the Beam Asymmetry Σ for Π⁰ and η Photoproduction on the Proton at Eγ=9 GeV
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PhysRevC.95.042201.pdf
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Author(s)
GlueX Collaboration
Al Ghoul, H.
Anassontzis, E. G.
Austregesilo, A.
Barbosa, F.
Barnes, A.
Beattie, T. D.
Bennett, D. W.
Berdnikov, V. V.
Black, T.
Date Issued
April 2017
Journal
Physical Review C
Publisher
American Physical Society (APS)
Citation
Al Ghoul, H. et al. “Measurement of the Beam Asymmetry Σ for Π⁰ and η Photoproduction on the Proton at Eγ=9 GeV.” Physical Review C 95, 4 (April 2017): 042201(R) © 2017 American Physical Society
Version
Final published version
Abstract
We report measurements of the photon beam asymmetry Σ for the reactions γ - p→pπ0 and γ - p→pη from the GlueX experiment using a 9 GeV linearly polarized, tagged photon beam incident on a liquid hydrogen target in Jefferson Lab's Hall D. The asymmetries, measured as a function of the proton momentum transfer, possess greater precision than previous π⁰ measurements and are the first η measurements in this energy regime. The results are compared with theoretical predictions based on t-channel, quasiparticle exchange and constrain the axial-vector component of the neutral meson production mechanism in these models.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PHYSREVC.95.042201
