Speaker
Description
The primary motivation of the GlueX experiment at Jefferson Lab is the search for light hybrid mesons that are quark-antiquark pairs coupled to a gluonic field excitation.
GlueX uses a $\approx 9\;\mathrm{GeV}$ linearly-polarized real photon beam incident on a $\mathrm{LH}2$ target and a solenoid-based, large-acceptance detector. The facility completed the initial phase of data taking in 2018 and has many analysis efforts well underway.
These studies include searches for the $\pi_{1}\;(1600)$ hybrid meson with exotic $J^{PC}=1^{-+}$. There is strong evidence for $J^{PC}=1^{-+}$ resonance reported from studies of $\eta^{\left( '\right) }\pi$ systems. At GlueX we are studying contributions of resonances with different spins in the mass spectrum of the $\eta^{\left( '\right) }\pi$ system via partial wave analysis, where we use a newly developed model for photo-production via linearly polarized beam. There are parallel studies of $\eta^{\left( '\right) }\pi$ system, by considering various production and decay modes ($\gamma p\rightarrow p \eta \pi^{0}, \gamma p\rightarrow \Delta^{++} \eta \pi^{-}, \gamma p\rightarrow p \eta^{'} \pi^{0}, \gamma p\rightarrow \Delta^{++}\eta^{'}\pi^{-}$).
The status of these efforts will be reported.
