Properties of strange vector mesons in dense and hot matter

Abstract

We investigate the in-medium properties of strange vector mesons ($K^{\ast }$ and ${\bar{K}}^{\ast }$) in dense and hot nuclear matter based on chirally motivated models of the meson selfenergies. We parameterise medium effects as density or temperature dependent effective masses and widths, obtain the vector meson spectral functions within a Breit-Wigner prescription (as often used in transport simulations) and study whether such an approach can retain the essential features of full microscopic calculations. For ${\mu }_B\ne 0$ the medium corrections arise from ${\bar{K}}^{\ast }(K^{\ast })N$ scattering and the ${\bar{K}}^{\ast }(K^{\ast })\to \bar{K}(K)\pi$ decay mode (accounting for in-medium $\bar{K}(K)$ dynamics). We calculate the scattering contribution to the $K^{\ast }$ selfenergy based on the hidden local symmetry formalism for vector meson nucleon interactions, whereas for the ${\bar{K}}^{\ast }$ selfenergy we implement recent results from a selfconsistent coupled-channel determination within the same approach. For ${\mu }_B\simeq 0$ and finite temperature we rely on a phenomenological approach for the kaon selfenergy in a hot pionic medium consistent with chiral symmetry, and evaluate the ${\bar{K}}^{\ast }(K^{\ast })\to \bar{K}(K)\pi$ 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 selfenergy.

17 pages, 7 figures; improved results, extended discussion on theoretical uncertainty of the K* selfenergy

References in corpus (10)

• In-medium nuclear interactions of low-energy hadrons
• Dilepton production and off-shell transport dynamics at SIS energies
• Production of K+ and of K- Mesons in Heavy-Ion Collisions from 0.6 to 2.0 AGeV Incident Energy
• Interaction of vector mesons with baryons and nuclei
• Strange mesons in nuclear matter at finite temperature
• Antikaons and hyperons in nuclear matter with saturation
• Chiral SU(3) Dynamics and Antikaon-Nuclear quasibound States
• ${\bar{K}}^{\ast }$ meson in dense matter
• Direct photon production from hadronic sources in high-energy heavy-ion collisions
• Strange and heavy mesons in hadronic matter

Cited by in corpus (9)

• Anti-strange meson-baryon interaction in hot and dense nuclear matter
• Probing the hot and dense nuclear matter with $K^{\ast },{\bar{K}}^{\ast }$ vector mesons
• $K^{\ast }$ vector meson resonances dynamics in heavy-ion collisions
• A study of the $KN$-$K^{\ast }N$ coupled systems
• Near-threshold $K^{\ast }(892{)}^{+}$ meson production in the interaction of ${\pi }^{-}$ mesons with nuclei
• Spectral functions of strange vector mesons in asymmetric hyperonic matter
• Medium effects in antikaon-induced ${\Xi }^{-}$ hyperon production on nuclei near threshold
• Antikaon-induced $K_1(1270{)}^{+}$ meson production on nuclei near threshold
• Medium modification of strange hadronic resonances at SIS, RHIC and LHC energies