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HK: Fachverband Physik der Hadronen und Kerne
HK 32: Heavy-Ion Collisions and QCD Phases VI
HK 32.1: Group Report
Tuesday, March 12, 2024, 17:30–18:00, HBR 62: EG 03
Non-perturbative insights into the spectral properties of QCD within the chiral crossover region — •Peter Lowdon1, Owe Philipsen1, Olaf Kaczmarek2, Dibyendu Bala2, and Tristan Ueding2 — 1Institut für Theoretische Physik, Goethe-Universität, Germany — 2Fakultät für Physik, Universität Bielefeld, Germany
Determining the type of excitations that can exist in a thermal medium is key to understanding how hadronic matter behaves at extreme temperatures. Here I report on a recent approach which utilises the non-perturbative constraints imposed by causality. By analysing finite-temperature lattice QCD data for spatial correlators of pseudo-scalar mesons comprised of light-light, light-strange, and strange-strange quarks, we find evidence for the existence of distinct low-energy stable particle-like excitations, so-called thermoparticles. These excitations are shown to be present around the chiral crossover region, and correspond to the collisionally-broadened vacuum ground states, which for the light-light and light-strange channels are the pion and kaon. Overall, these findings suggest that at high temperatures light pseudo-scalar mesons in QCD still have a bound-state-like structure.
Keywords: Lattice QCD; Finite temperature QFT; Chiral crossover; Pseudo-scalar mesons