The Thermal Width of the Glueball at Non-Zero Temperature

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.Comment: Talk given at LATTICE 2002, The XX International Symposium on Lattice Field Thoery, Massachusetts, USA, June 24-29, 2002, Lattice2001(nonzerot), 1 figure, 3 page

Charmonium properties at finite temperature on quenched anisotropic lattices

We study charmonium properties below and above $T_c$ up to 1.8$T_c$, on quenched anisotropic lattices. Information of the spectral functions is extracted using the maximum entropy method and the constrained curve fitting. We also calculate the color singlet and averaged free energies and evaluate the charmonium spectrum with the potential model analysis. The relation between the lattice result of the spectral function analysis and the potential model is discussed.Comment: Lattice2004(non-zero), 3 pages, 4 figure

Magnetic Phase Diagram of Bi₂CuO₄

The ground state spin configuration in Bi₂CuO₄-type crystal having two magnetic ions in the unit cell is studied on the basis of the Heisenberg model with four kinds of superexchange interaction. The magnetic phase diagram is found to be composed of five regions: four of wich are collinear spin arrangement and one is of double helical spin arrangement. The values of exchange integrals of Bi₂CuO₄ estimated by Aïn et al from their own neutron scattering data are in the region where the observed collinear spin arrangement is stabilized.Article信州大学理学部紀要 30(2): 55-67(1996)departmental bulletin pape

Residual Currents around Asymmetrical Pipes in Oscillatory Flow Fields

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

MEM Analysis of Glueball Correlators at T>0

Maximum Entropy Method (MEM) is applied to glueball correlators at finite temperature constructed by using 5,500-9,900 gauge field configurations generated in SU(3) quenched lattice QCD with the lattice parameter beta = 2N_c/g^2 = 6.25 and the renormalized anisotropy a_s/a_t = 4. The results support the thermal width broadening of the 0++ glueball near the critical temperature.Comment: Talk given at LATTICE 2003, The XXI International Symposium on Lattice Field Thoery, Tsukuba International Congress Center, Tsukuba, Ibaraki, Japan, July 15-19, 2003, Lattice2003(nonzerot), latex2e, 1 figure, 3 page