Spin-Density Matrix Elements for Vector Meson Photoproduction at GlueX

Abstract

The GlueX experiment at Jefferson Lab aims to study the light meson spectrum with an emphasis on the search for hybrid mesons. To this end, a linearly-polarized $9$GeV photon beam impinges on a hydrogen target contained within a detector with near-complete neutral and charged particle coverage. In 2018, the experiment completed its first phase of data taking in its design configuration and the quantity of analyzed data already exceed that of previous experiments for polarized photoproduction in this energy regime by orders of magnitude. Polarization observables such as spin-density matrix elements provide valuable input for the theoretical description of the production mechanism, which will be essential for the interpretation of possible exotic meson signals. We present results for the photoproduction of vector mesons, focusing on the unprecedented statistical precision of the spin-density matrix elements for the $\rho (770)$ meson.

Proceedings for the 5th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2019), June 2-7 2019, Pittsburgh, Pennsylvania

References in corpus (5)

• Measurement of the beam asymmetry $\Sigma$ for ${\pi }^0$ and $\eta$ photoproduction on the proton at $E_{\gamma }=9$ GeV
• Construction and Performance of the Barrel Electromagnetic Calorimeter for the GlueX Experiment
• Vector Meson Photoproduction with a Linearly Polarized Beam
• The GlueX Start Counter Detector
• Design and construction of a high-energy photon polarimeter

Cited by in corpus (2)

• 50 Years of Quantum Chromodynamics
• Measurement of Spin-Density Matrix Elements in $\rho (770)$ Production with a Linearly Polarized Photon Beam at $E_{\gamma }=8.2-8.8\text{GeV}$