Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Heavy-Ion Collisions and QCD Phases IV
HK 19.3: Talk
Tuesday, March 11, 2025, 16:15–16:30, HS 3 Chemie
In-Medium Vector Meson Polarization from FRG — •Maximilian Wiest1, Tetyana Galatyuk1,2,3, Lorenz von Smekal3,4, and Jochen Wambach1 — 1Institut für Kernphysik - TU Darmstadt, Darmstadt, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 3Helmholtz Research Academy Hesse for FAIR (HFHF) — 4Justus Liebig University Giessen, Germany
In this talk, we will discuss the FRG treatment of the chiral parity doublet model (PDM) to extract in-medium vector-spectral functions at finite spatial momenta. The PDM incorporates mesons and baryons as effective degrees of freedom including chiral and parity partners. Our theoretical approach is based on the Functional Renormalization Group (FRG) which represents a non-perturbative framework that is capable of including both quantum and thermal fluctuations. The in-medium rho-meson spectral function is calculated using the analytically-continued FRG (aFRG) method. Our results show strong modifications of the spectral functions with increasing spatial momentum. Using a coarse-graining approach, we can extract dilepton spectra from microscopic transport approaches using the obtained vector spectral functions and extract the impact of the mirror-baryon peak on the dilepton spectra. For comparison, we will also show corresponding calculations for state-of-the-art in medium spectral functions. The extraction of finite momentum spectral functions also gives access to the polarization signal of vector mesons, which carries information of the dominant production processes.
Keywords: FRG; Dileptons; Vector mesons; Polraization; Heavy-ion collisions