Speaker
Description
Hadronic physics aims to understand the contribution of quarks, gluons, and their internal dynamics in the for- mation of hadrons. Quantum Chromodynamics predicts a number of bound states, including those having an explicit gluonic degree of freedom called hybrids, but only a few have been confirmed experimentally. The GlueX experiment at Jefferson Lab, USA, utilizes a linearly polarized photon beam of 8-9 GeV and a large solid-angle particle detector for hadron spectroscopy. Among the physics goals are the study of the hybrid meson spectrum and the search for mesons with exotic quantum numbers. Recently, the signatures of a predicted exotic isoscalar, η1 has been reported by the BESIII collaboration in the radiative decay of J/ψ → η1γ → ηη′γ. The production of a two pseudoscalar system, ηη′, is also allowed in the photon-induced interaction γp → ηη′p and can be reconstructed with the GlueX spectrom- eter, giving us an excellent opportunity to validate η1’s existence. An analysis of this two-meson system based on a statistics-limited GlueX data set did not provide a conclusive result. Recently, the data set has been increased by a factor of 2-3, which will facilitate this search. Preliminary studies for this channel will be presented.
| Keyword-1 | hadron spectroscopy |
|---|---|
| Keyword-2 | exotic hybrid meson |
| Keyword-3 | GlueX Experiment |