Meson Correlators in Finite Temperature Lattice QCD

We analyze temporal and spatial meson correlators in quenched lattice QCD at T>0. Below T_c we observe little change in the meson properties as compared with T=0. Above T_c we observe new features: chiral symmetry restoration and signals of plasma formation, but also indication of persisting mesonic (metastable) states and different temporal and spatial masses in the mesonic channels. This suggests a complex picture of QGP in the region 1 - 1.5 T_c

Quenched charmonium near the continuum limit

We study relativistic charmonium on very fine quenched lattices (beta=6.4 and 6.6). We concentrate on the calculation of the hyperfine splitting between eta_c and J/psi, aiming for a controlled continuum extrapolation of this quantity. Results for the eta_c and J/psi wave functions are also presented

Screening mass responses to chemical potential at finite temperature

Responses to chemical potential of the pseudoscalar meson screening mass and the chiral condensate in lattice QCD are investigated. On a $16 \times 8^2 \times 4$ lattice with two flavors of staggered quarks the first and second responses below and above $T_c$ are evaluated. Different behavior in the low and the high temperature phases are observed, which may be explained as a consequence of the chiral symmetry breaking and restoration

Lattice calculations of meson correlators and spectral functions at finite temperature

I review recent progress in relating meson spectral function to imaginary time correlation function at finite temperature calculated on isotropic as well as on anisotropic lattices. Special attention is payed for the lattice artifacts present in calculation of meson spectral functions. Results in the case of light quarks as well as heavy quarks are reviewed which indicate in particular that even in the chiral limit meson spectral functions have non-trivial structure and the ground state quarkonia survive up to temperature 1.5T_cComment: Invited plenary talk presented at SQM03 (Atlantic Beach, March 12-17, 2003), 10 pages LaTeX, uses iopams.sty, iopart.cl

Meson correlators in finite temperature lattice QCD

We analyze temporal and spatial meson correlators in quenched lattice QCD at T>~0. Below Tc we observe little change in the meson properties as compared with T=0. Above Tc we observe new features: chiral symmetry restoration and signals of plasma formation, but also an indication of persisting “mesonic" (metastable) states and different temporal and spatial “masses" in the mesonic channels. This suggests a complex picture of QGP in the region (1–1.5)Tc