The Thermal Glueball in SU(3) Anisotropic Lattice QCD

The thermal glueball is studied at finite temperature by using SU(3) anisotropic lattice QCD with β_lat = 6.25, the renormalized anisotropy ξ ≡ a_s/a_t = 4 over the lattice of the size 20³ × N_t with various N_t at the quenched level. While the narrow peak ansatz leads to the significant pole-mass reduction of about 300 MeV near the critical temperature T_c, Breit-Wigner ansatz which can take into account the possible appearance of the thermal width leads to the significant thermal width broadening of about 300 MeV with a modest reduction of the peak center of about 100 MeV.