Effect of mesonic off-shell correlations in the PNJL equation of state

We study the meson contribution to the equation of state of the 2-flavor Polyakov-loop Nambu--Jona-Lasinio model, including the full momentum dependence of the meson polarization loops. Within the Beth-Uhlenbeck approach, we demonstrate that the contribution from the quark-antiquark continuum excitations in the spacelike region ${\ensuremath{\omega}}^{2}\ensuremath{-}{q}^{2}<0$, i.e., the Landau damping, leads to an increase of the pressure for temperatures $\ensuremath{\gtrsim}0.8{T}_{c}^{\ensuremath{\chi}}$ and a significant meson momentum cutoff dependence in the mesonic pressure and the QCD trace anomaly. We investigate the dependence of the results on the choice of the Polyakov-loop potential parameter ${T}_{0}$. From the dependence of the mesonic pressure on the current quark mass, by means of the Feynman-Hellmann theorem, we evaluate the contribution of the pion quasiparticle gas and Landau damping to the chiral condensate.

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