Quark Gluon Bags as Reggeons
K. A. Bugaev, V. K. Petrov, G. M. Zinovjev

TL;DR
This paper presents a solvable model analyzing how medium-dependent widths of QGP bags influence their equation of state, explaining resonance deficits and the non-observability of heavy QGP bags, with estimates consistent across lattice QCD data.
Contribution
It introduces a model incorporating finite widths of QGP bags, linking Regge trajectory behavior to temperature-dependent properties, and resolves contradictions in hadronic mass spectrum theories.
Findings
Minimal resonance width at zero temperature is about 600 MeV.
At high temperatures, QGP bag properties align with linear Regge asymptotics.
Lattice QCD pressure includes T-linear and T^4 ln T terms between 240-420 MeV.
Abstract
The influence of the medium dependent finite width of QGP bags on their equation of state is analyzed within an exactly solvable model. It is argued that the large width of the QGP bags not only explains the observed deficit in the number of hadronic resonances, but also clarifies the reason why the heavy QGP bags cannot be directly observed as metastable states in a hadronic phase. The model allows us to estimate the minimal value of the width of QGP bags from a variety of the lattice QCD data and get that the minimal resonance width at zero temperature is about 600 MeV, whereas the minimal resonance width at the Hagedorn temperature is about 2000 MeV. As shown these estimates are almost insensitive to the number of the elementary degrees of freedom. The recent lattice QCD data are analyzed and it is found that besides sigma T**4 term the lattice QCD pressure contains T-linear and T**4…
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