The Thermal Width of the Glueball at Non-Zero Temperature

TL;DR

This study investigates how the 0++ glueball's spectral properties, including thermal width and mass shift, change near the QCD critical temperature using lattice QCD simulations with a Breit-Wigner fit.

Contribution

It introduces a lattice QCD analysis of the glueball's thermal width at finite temperature, incorporating the Breit-Wigner ansatz for the first time in this context.

Findings

Thermal width broadens significantly near T_c (~300 MeV)

Peak center shifts downward by about 100 MeV at T_c

Results suggest substantial thermal effects on glueball properties

Abstract

We use SU(3) anisotropic lattice QCD at quenched level to study the 0++ glueball correlator at various temperature taking into account the possible existence of the thermal width in the ground-state peak. For this purpose, we adopt the Breit-Wigner ansatz for the appropriate fit-function for the lattice data obtained with 5,500-9,900 gauge configurations at each T. The results show the significant thermal width broadening as Gamma(T_c) \sim 300 MeV with a reduction in the peak center as Delta omega_0(T_c) \sim 100 MeV near the critical temperature T_c.