QNP2022 - The 9th International Conference on Quarks and Nuclear Physics

Search for exotic-quantum-number mesons with the GlueX experiment

Sep 6, 2022, 9:30 AM

30m

online

Plenary

Speaker

Mariana Khachatryan (ODU)

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 ${\eta }^{\left({}^{\prime }\right)}\pi$ systems. At GlueX we are studying contributions of resonances with different spins in the mass spectrum of the ${\eta }^{\left({}^{\prime }\right)}\pi$ system via partial wave analysis, where we use a newly developed model for photo-production via linearly polarized beam. There are parallel studies of ${\eta }^{\left({}^{\prime }\right)}\pi$ system, by considering various production and decay modes ($\gamma p\to p\eta {\pi }^0,\gamma p\to {\mathrm{\Delta }}^{++}\eta {\pi }^{-},\gamma p\to p{\eta }^{{}^{\prime }}{\pi }^0,\gamma p\to {\mathrm{\Delta }}^{++}{\eta }^{{}^{\prime }}{\pi }^{-}$).
The status of these efforts will be reported.

Presentation materials

Mariana_QNP_Sep5_2022_ver3.pdf