The Thermal Glueball at Finite Temperature in Su(3) Anisotropic Lattice Qcd∗

The thermal glueball is studied at finite temperature by using SU(3) anisotropic lattice QCD with βlat = 6.25, the renormalized anisotropy ξ ≡ as/at = 4 over the lattice of the size 20 × Nt with various Nt at the quenched level. While the narrow peak ansatz leads to the significant polemass reduction of about 300 MeV near the critical temperature Tc, 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.