2025/06/17 by Á. Gómez Nicola, Nicola, Angel Gómez, Andrea Vioque-Rodríguez +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2506.14599
openalex publication_date 2025/06/17 · openalex created_date 2025/10/18 · openalex updated_date 2026/08/02
Building upon recent results on the role of thermal resonances in chiral symmetry restoration, we show that a description of the QCD scalar susceptibility at finite temperature T saturated by the thermal properties of the lightest scalar resonance, the f0(500), is compatible both with lattice QCD data at nonzero T and with the T=0 light resonance properties coming from experimental data. The thermal f0(500) is generated within the framework of Unitarized Chiral Perturbation Theory. This method allows us to achieve a good description of lattice QCD results with a reliable pion mass dependence. In particular, we perform direct fits to the chiral susceptibility measured in lattice data at different pion masses and temperatures, obtaining a remarkable agreement for the susceptibility and for mass differences of the light quark condensate. In addition, the fitted low-energy constants are compatible with T=0 phenomenology. Our results confirm the role of unitarized approaches and thermal resonances in the dynamics of the QCD transition.