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.

Highlights

  • Measurement of the beam asymmetry Σ for π0 and η photoproduction on the proton at Eγ = 9 GeV

  • We report measurements of the photon beam asymmetry Σ for the reactions γp → pπ0 and γp → 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

  • Understanding the meson photoproduction mechanism at high energies is a vital component of a broader program to search for gluonic excitations in the meson spectrum through photoproduction reactions, which is the primary goal of the GLUEX experiment at Jefferson Lab

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Summary

Introduction

We report measurements of the photon beam asymmetry Σ for the reactions γp → pπ0 and γp → 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. We report on the linearly polarized photon beam asymmetry Σ in high-energy π0 and η photoproduction from the GLUEX experiment.

Results
Conclusion

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