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Measurement of the beam asymmetry $\Sigma$ for $\pi^0$ and $\eta$ photoproduction on the proton at $E_\gamma = 9$ GeV
- Source :
- Phys. Rev. C 95, 042201 (2017)
- Publication Year :
- 2017
-
Abstract
- We report measurements of the photon beam asymmetry $\Sigma$ for the reactions $\vec{\gamma}p\to p\pi^0$ and $\vec{\gamma}p\to p\eta $ 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 $\pi^0$ measurements and are the first $\eta$ measurements in this energy regime. The results are compared with theoretical predictions based on $t$-channel, quasi-particle exchange and constrain the axial-vector component of the neutral meson production mechanism in these models.<br />Comment: 6 pages, 6 figures, Published in Physical Review C: Rapid Communication
- Subjects :
- Nuclear Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. C 95, 042201 (2017)
- Publication Type :
- Report
- Accession number :
- edsarx.1701.08123
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevC.95.042201