Measurement of the beam asymmetry $\Sigma$ for ${\pi }^0$ and $\eta$ photoproduction on the proton at $E_{\gamma }=9$ GeV

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.

arXiv comment6 pages, 6 figures, Published in Physical Review C: Rapid Communication

References in corpus (10)

• Progress Toward Understanding Baryon Resonances
• First Results from The GlueX Experiment
• Finite-Energy Sum Rules in Eta Photoproduction off the Nucleon
• Neutral Pion Photoproduction in a Regge Model
• Toward Complete Pion Nucleon Amplitudes
• The Primakoff effect on a proton target
• The GlueX Central Drift Chamber: Design and Performance
• Unitarity constraints on neutral pion electroproduction
• Photoproduction of $a_0(980)$ and $f_0(980)$
• A measurement of the energy and timing resolution of GlueX Forward Calorimeter using an electron beam

Cited by in corpus (45)

• Feebly-Interacting Particles:FIPs 2020 Workshop Report
• Three-body Unitarity in the Finite Volume
• Coupling QCD-scale axion-like particles to gluons
• Photoproduction of axion-like particles
• The GlueX Beamline and Detector
• Etaprime and Eta Mesons with Connection to Anomalous Glue
• Heavy QCD Axion in $b\to s$ transition: Enhanced Limits and Projections
• Heavy QCD Axion at Belle II: Displaced and Prompt Signals
• Construction and Performance of the Barrel Electromagnetic Calorimeter for the GlueX Experiment
• Pole position of the $a_1(1260)$ resonance in a three-body unitary framework
• Dalitz plots and lineshape of $a_1(1260)$ from a relativistic three-body unitary approach
• Extraction of the Parton Momentum-Fraction Dependence of Generalized Parton Distributions from Exclusive Photoproduction
• Moments of angular distribution and beam asymmetries in $\eta {\pi }^0$ photoproduction at GlueX
• Vector Meson Photoproduction with a Linearly Polarized Beam
• Measurement of the helicity asymmetry $E$ in $\omega \to {\pi }^{+}{\pi }^{-}{\pi }^0$ photoproduction
• Beam Asymmetry $\mathbf{\Sigma }$ for the Photoproduction of $\eta$ and ${\eta }^{\prime }$ Mesons at ${\mathbf{E}}_{\gamma }=8.8$GeV
• Design and construction of a high-energy photon polarimeter
• Exclusive photoproduction of ${\pi }^0$ up to large values of Mandelstam variables $s,t$ and $u$ with CLAS
• Regge phenomenology in ${\pi }^0$ and $\eta$ photoproduction
• Exclusive tensor meson photoproduction
• New analysis of $\eta \pi$ tensor resonances measured at the COMPASS experiment
• Bound states in the B-matrix formalism for the three-body scattering
• Measurement of Spin-Density Matrix Elements in $\rho (770)$ Production with a Linearly Polarized Photon Beam at $E_{\gamma }=8.2-8.8\text{GeV}$
• Features of $\pi \Delta$ Photoproduction at High Energies
• Light-Meson Spectroscopy at GlueX
• Twist-3 contributions to wide-angle photoproduction of pions
• Global analysis of charge exchange meson production at high energies
• On the $\eta$ and ${\eta }^{\prime }$ Photoproduction Beam Asymmetry at High Energies
• Search for photoproduction of axion-like particles at GlueX
• Moravcsik's theorem on complete sets of polarization observables reexamined
• Structure of Pion Photoproduction Amplitudes
• Measurement of beam asymmetry for ${\pi }^{-}{\Delta }^{++}$ photoproduction on the proton at $E_{\gamma }$=8.5 GeV
• Search for axion-like particles through nuclear Primakoff production using the GlueX detector
• Search for exotic states in photoproduction at GlueX
• Photoproduction of $\eta$ mesons off the proton for $1.2<E_{\gamma }<4.7$ GeV using CLAS at Jefferson Laboratory
• Strong decays of strange quarkonia in a corrected 3P0 model
• Spin-Density Matrix Elements for Vector Meson Photoproduction at GlueX
• Searches for Exotic Hadrons at GlueX
• Pseudoscalar and Scalar Meson Photoproduction Interpreted by Regge Phenomenology
• Role of scalar mesons in the beam asymmetry of $p\bar{p}$ and $\Lambda \bar{\Lambda }$ photoproduction at JLab
• Photoproductions of $f_1(1285)$ and ${\eta }^{\prime }(958)$ from the analysis of CLAS data with the Primakoff effect at high energies
• The GlueX Experiment: Recent Results and Future Plans
• New Physics Searches at Kaon and Hyperon Factories
• Beam Asymmetries ($\Sigma$) for ${\pi }^0$, $\eta$ and ${\eta }^{\prime }$ in Photoproduction at GlueX
• New graphical criterion for the selection of complete sets of polarization observables and its application to single-meson photoproduction as well as electroproduction