Abstract

The goal of the GlueX experiment is to provide critical data to help understand the soft gluonic field responsible for binding quarks in hadrons. 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. Photoproduction is expected to be particularly effective in producing exotic hybrids but there is little data on the photoproduction of light mesons. GlueX will use the new 12-GeV electron beam to produce a 9-GeV beam of linearly polarized photons using the technique of coherent bremsstrahlung. A solenoid-based hermetic detector is under construction, which will be used to collect data on meson production and decays. These data will also be used to study the spectrum of conventional mesons, including the poorly understood excited vector mesons. This talk will describe the latest theoretical developments to help understand how the data of hybrid mesons can provide insights into the fundamental theory of strong interactions.

Highlights

  • Introduction and backgroundQuark degrees of freedom are displayed explicitly in the known hadron spectrum

  • 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 gluon fields that confine the quarks inside hadrons have been shy to manifest their presence in the static properties of the measured spectrum. These gluonic degrees of freedom and interactions that are present in the QCD Lagrangian, are expected to give rise to many states in the spectrum with unique signatures

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Summary

Introduction and background

The gluon fields that confine the quarks inside hadrons have been shy to manifest their presence in the static properties of the measured spectrum These gluonic degrees of freedom and interactions that are present in the QCD Lagrangian, are expected to give rise to many states in the spectrum with unique signatures. In a series of recent papers [2, 4–6], the Hadron Spectrum Collaboration has explored the spectrum of mesons and baryons using a large basis of composite QCD interpolating fields, extracting a spectrum of states of determined JPC, including states of high internal excitation Exotic hybrids are predicted only when the quarks have their spins aligned

Understanding the spectrum
Photoproduction
The GlueX Experiment
Initial physics goals and sensitivity
Findings
Status and Summary
Full Text
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