Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 42: Schwerionenkollisionen und QCD Phasen
HK 42.3: Vortrag
Donnerstag, 20. März 2014, 14:45–15:00, HZ 7
In-medium properties of strange vector mesons in dense and hot nuclear matter — •Andrej Ilner1, Daniel Cabrera1,2, Pornrad Srisawad3, and Elena Bratkovskaya1,2 — 1Institut für theoretische Physik, Johann Wolfgang-Goethe Universität, Frankfurt am Main, Deutschland — 2FIAS, Frankfurt am Main, Deutschland — 3Faculty of Science, Naresuan University, Phitsanulok, Thailand
We investigate the in-medium properties of strange vector mesons (K* and K*) in dense and hot nuclear matter based on chirally motivated models of the meson self-energies. We parameterise medium effects as density or temperature dependent effective masses and widths, obtain the vector meson spectral functions within a Breit-Wigner prescription (which is often used in transport simulations), and study whether such an approach can retain the essential features of full microscopic calculations. For µB≠ 0 the medium corrections arise from K* (K*) N scattering and the K* (K*) → K (K) π decay mode (accounting for in-medium K (K) dynamics). We calculate the scattering contribution to the K* self-energy based on the hidden local symmetry formalism for vector meson nucleon interactions, whereas for the K* self-energy we implement recent results from a self-consistent coupled-channel determination within the same approach. For µB≃ 0 and finite temperature we rely on a phenomenological approach for the kaon self-energy in a hot pionic medium consistent with chiral symmetry, and evaluate the K* (K*) → K (K) π decay width. The emergence of a mass shift at finite temperature is studied with a dispersion relation over the imaginary part of the vector meson self-energy.