Temperature Dependence of the Masses of Various Meson States: A Comparative Study in SU(3) and SU(4) extended Linear-Sigma Model

2025/12/20 by A. V. Friesen, Yu. L. Kalinovsky, Friesen, Alexandra +6
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #High-Energy Particle Collisions Research #Pulsars and Gravitational Waves Research #Quantum Chromodynamics and Particle Interactions

paper · doi:10.48550/arxiv.2512.22198

openalex publication_date 2025/12/20 · openalex created_date 2025/12/31 · openalex updated_date 2026/07/28

Abstract

In the extended Linear-Sigma Model (eLSM), the chiral phase structure of meson states, including pseudoscalars (J^pc=0^-+), scalars (J^pc=0⁺⁺), vectors (J^pc=1^--), and axial-vectors (J^pc=1⁺⁺), is investigated with the mean-field approximation. A systematic comparison between SU(3) and SU(4) configurations is provided. It has been found that the estimations of meson masses derived from SU(4) eLSM are more congruent with experimental values than those derived from SU(3) eLSM. Consequently, we conclude that an increase in quark degrees of freedom significantly enhances the accuracy of meson mass simulations. We investigate the effect of temperature on the masses of various meson states calculated in the SU(3) and SU(4) eLSM. After establishing all the fitting parameters, the temperature dependence of meson masses shows that although various meson states exhibit unique patterns in their mass changes with temperature, they all seem to share a similar range of dissolution temperatures. This means that the critical temperature that marks the phase transition from hadrons to quarks appears to vary slightly depending on the meson states. In this regard, we find that the quarkonium states, formed by a quark and its antiquark, are largely unaffected by variations in the temperature.

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• Screening masses of positive- and negative-parity hadron ground-states, including those with strangeness