Finite-temperature corrections in the dilated chiral quark model.

Abstract

We calculate the finite-temperature corrections in the dilated chiral quark model using the effective potential formalism. Assuming that the dilaton limit is applicable at some short length scale, we interpret the results to represent the behavior of hadrons in dense and hot matter. We obtain the scaling law, ${\mathit{f}}_{\mathrm{\ensuremath{\pi}}}$(T)/${\mathit{f}}_{\mathrm{\ensuremath{\pi}}}$ =${\mathit{m}}_{\mathit{Q}}$(T)/${\mathit{m}}_{\mathit{Q}}$\ensuremath{\simeq}${\mathit{m}}_{\mathrm{\ensuremath{\sigma}}}$(T)/${\mathit{m}}_{\mathrm{\ensuremath{\sigma}}}$ while we argue, using partial conservation of axial-vector current, that pion mass does not scale within the temperature range involved in our Lagrangian. It is found that the hadron masses and the pion decay constant drop faster with temperature in the dilated chiral quark model than in the conventional linear \ensuremath{\sigma} model that does not take into account the QCD scale anomaly. We attribute the difference in scaling in heat bath to the effect of baryonic medium on thermal properties of the hadrons. Our finding would imply that the alternating-gradient synchrotron experiments (dense and hot matter) and the RHIC experiments (hot and dilute matter) will ``see'' different hadron properties in the hadronization phase.