Abstract
The GlueX experiment[1] is scheduled to begin taking data in 2015. The goal is to discover evidence for the existence of exotic hybrid mesons and to map out their spectrum in the light quark sector. Recent theoretical developments using Lattice QCD [2] predict exotic hybrid states in a mass range accessible using the newly upgraded 12GeV electron accelerator at Jefferson Lab. Hybrid mesons, and in particular exotic hybrid mesons, provide the ideal laboratory for testing QCD in the confinement regime since these mesons explicitly manifest the gluonic degrees of freedom. The experiment will use 9 GeV linearly polarized photons produced via coherent Bremsstrahlung to produce the exotic hybrids. The decay products will be detected in the solenoid-based GlueX detector currently under construction at Jefferson Lab. The status of the GlueX experiment including detector parameters will be presented along with theoretical motivation for the experiment.
Highlights
Recent Lattice QCD calculations have predicted the existence of meson states in which the quark and anti-quark are bound together by a gluonic field that itself contributes to the quantum numbers of the state[2, 3]
These so-called hybrid states are predicted to exist in a mass range starting at about 2 GeV as shown in figure 1
The states are grouped by JPC quantum numbers where J is the total angular momentum, P = (−1)L is the parity, and C = (−1)L+S the charge conjugation of the state
Summary
Recent Lattice QCD calculations have predicted the existence of meson states in which the quark and anti-quark are bound together by a gluonic field that itself contributes to the quantum numbers of the state[2, 3]. These so-called hybrid states are predicted to exist in a mass range starting at about 2 GeV as shown in figure 1 (blue frames). The “glue” can contribute to the overall JPC state of the meson (qqg) allowing for the so called “exotic” states such as 0+−, 1−+, and 2+− The lightest of these is predicted to be the 1−+ state as shown in the figure. GlueX is part of a larger project to upgrade the Jefferson Lab electron accelerator that will double its energy to 12 GeV
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