Hadron properties at finite temperature and density with two-flavors of Wilson fermion

Abstract

, where T pc is the pseudo-critical temperature. We find that the temperature dependence of the screening masses normalized by temperature, M 0 /T , shows notable structure around T pc , and approach 2π at high temperature in both channels, which is consistent with twice the thermal mass of a free quark in high temperature limit. The screening masses at low density are also investigated by using the Taylor expansion method with respect to the quark chemical potential. We find that the expansion coefficients in the leading order become positive in the temperature range, and thermal and density effect on the meson screening-masses becomes apparent in the quark-gluon plasma phase. The meson screening-masses are also compared with the gluon (Debye) screening masses at finite temperature and density.

In-medium modifications of open and hidden strange-charm mesons from spatial correlation functions

“…Thus the transition between these two limiting values of the screening mass can be used as an indicator for the thermal modification and eventual dissolution of mesonic excitations. Lattice QCD studies of the screening masses of light quark mesons have been performed within the quenched approximation [22,23] and also with two dynamical flavors using staggered [24] as well as Wilson-type quarks [25]. Screening masses in the light and strange quark sector have been studied recently in (2 + 1)-flavor QCD using the so-called p4 staggered fermion action [26,27] and the expected qualitative behavior discussed above was observed.…”

Thermal modifications of mesons, and restoration of broken symmetries from spatial correlation functions with HISQ action

“…The spatial correlation functions and screening masses have been studies in lattice simulations with quenched approximation [8,9] as well as full-QCD approach with the staggered actions [10,11,12,13,14] and the Wilson actions [15]. By using the Highly Improved Staggered Quarks (HISQ) action the screening masses have been calculated for the meson states consisting of the strange (s) and charm (c) quarks [5] and, in this report, we develop those to including the light, up/down (u/d) quarks.…”

Thermal modification of in-medium mesons from screening properties on the lattice

“…Lattice QCD studies of the screening masses of light quark mesons have been performed within the quenched approximation [17] and also with two dynamical flavors using staggered [18] as well as Wilson-type quarks [19]. Screening masses in the light and strange quark sector have been studied recently in (2 + 1)-flavor QCD using the so-called p4 staggered fermion action [20] and the expected qualitative behavior discussed above was observed.…”