Particle states of lattice QCD

Abstract

We determine the degeneracy factor and the average particle mass of particles that produce the lattice QCD pressure and specific entropy at zero baryon chemical potential. The number of states of the gluons and the quarks are found to converge above T = 230 MeV to almost constant values, close to the number of states of an ideal quark-gluon phase, while their assigned masses retain high values. The number of states and the average mass of a system containing quarks in interaction with gluons are found to decrease steeply with increase of temperature between T ∼ 150 and 160 MeV, a region contained within the region of the chiral transition. The minimum value of the number of states within this temperature interval indicates that the states are of hadronic nature.

Chiral QCD phase in equilibrium with Hadron Gas and the location of the critical point

“…This suggests that chiral restoration is completed well before quarks are "dissolved" to independent entities. (b) In [5] an equivalent description of the Lattice results at vanishing baryonic density has been carried out, using one particle state with mass and degeneracy factor calculated from the fit to these results. It was found that the quark-gluon interacting system, when crossing the critical temperature T c , exhibits an abrupt decrease in the degeneracy factor and, also, in the respective mass.…”