Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 3: Heavy-Ion Collisions and QCD Phases II
HK 3.4: Vortrag
Montag, 28. März 2022, 15:00–15:15, HK-H2
Dynamical broadening of vector-meson spectral functions — •Renan Hirayama1,2, Jan Staudenmaier2, and Hannah Elfner1,2 — 1Helmholtz Forschungsakademie Hessen für FAIR (HFHF), GSI Helmholtzzentrum für Schwerionenforschung, Frankfurt am Main, Germany — 2Frankfurt Institute for Advanced Studies (FIAS), Frankfurt am Main, Germany
We reconstruct effective spectral functions of the ρ-meson in different scenarios via lifetime analysis using the hadronic transport SMASH. The theoretical interest in the behavior of in-medium spectral functions lies in the expected restoration of chiral symmetry at high energy densities, which may be accessed experimentally by studying dilepton mass spectra in heavy-ion collisions. Within SMASH, a direct assessment of particle lifetimes and the mass distributions is possible. Our reconstruction of the spectral function consists in using the total width – considering both decays and collisions – as input for a Breit-Wigner ansatz. The broadening of the spectral function in a thermal system is shown to be consistent with model calculations, and the dependence of total width on local hadron density is provided. This broadening develops dynamically, since SMASH relies only on vacuum properties of resonances as an input. On the other hand, we present the effective ρ-meson spectral function for the dynamical evolution of heavy-ion collisions, finding a clear correlation of broadening to system size. The results shown in this work are of interest to distinguish dynamical broadening from additional genuine medium-modified spectral functions.