Hadronic spectrum of the quark plasma

We have carried out a numerical simulation in SU(3) lattice gauge theory with four flavors of low-mass staggered fermions at zero baryon-number density in the vicinity of the high-temperature phase transition on 6×${10}^3$ and 6×${10}^2$×20 lattices. Static screening masses (static susceptibilities) were measured in several color-singlet channels with quark valence qq¯ and qqq. Clear evidence for a hadronic screening spectrum is found, suggesting the presence of hadronic plasma modes. The spectral multiplets, extrapolated to zero quark mass, are consistent with a restoration of the SU(N)⊗SU(N) chiral symmetry.