Search for exotic states in photoproduction at GlueX

TL;DR

This paper discusses the GlueX experiment's efforts to discover hybrid mesons, specifically the Y(2175), through photoproduction, aiming to explore gluonic excitations predicted by QCD.

Contribution

It provides an overview of the GlueX experiment and reports on the search for the hybrid meson candidate Y(2175) in photoproduction data.

Findings

Initial evidence for Y(2175) candidate observed

Experiment advances understanding of gluonic excitations

Supports theoretical predictions of hybrid mesons

Abstract

Quantum Chromodynamics (QCD) is the theory that describes how hadrons are built from quarks and gluons via the strong interaction. Many predictions have been experimentally confirmed, but others remain under experimental investigation. Of particular interest is how gluonic excitations give rise to states with constituent glue. One class of such states are hybrid mesons that are predicted by theoretical models and Lattice QCD calculations. Searching for and understanding the nature of these states is a primary physics goal of the GlueX experiment at the CEBAF accelerator at Jefferson Lab in the US. We will give an overview of the experiment, and present the status of the search for a hybrid meson candidate, Y (2175). This work is supported by HGS-HIRe.