In-medium effects in strangeness production in heavy-ion collisions at (sub)threshold energies

Taesoo Song, Laura Tolos, Joana Wirth, Joerg Aichelin, and Elena Bratkovskaya
Phys. Rev. C 103, 044901 – Published 8 April 2021

Abstract

We study the in-medium effects in strangeness production in heavy-ion collisions at (sub)threshold energies of (1–2)A GeV based on the microscopic Parton-Hadron-String Dynamics (PHSD) transport approach. The in-medium modifications of the antikaon (K¯=K,K¯0) properties are described via the self-consistent coupled-channel unitarized scheme based on a SU(3) chiral Lagrangian which incorporates explicitly the s and p waves of the kaon-nucleon interaction. This scheme provides the antikaon potential, spectral functions, and reaction cross sections as well as their dependence on baryon density, temperature, and antikaon momentum in the nuclear medium, which are incorporated in the off-shell dynamics of the PHSD. The in-medium modification of kaons (K=K+,K0) are accounted via the kaon-nuclear potential, which is assumed to be proportional to the local baryon density. The manifestation of the medium effects in observables is investigated for the K and K¯ rapidity distributions, pT spectra, the polar and azimuthal angular distributions, and directed (v1) and elliptic (v2) flows in C+C, Ni+Ni, and Au+Au collisions. We find—by comparison to experimental data from the KaoS, FOPI, and HADES Collaborations—that the modifications of (anti)kaon properties in nuclear matter are necessary to explain the data in a consistent manner. Moreover, we demonstrate the sensitivity of kaon observables to the equation of state of nuclear matter.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
19 More
  • Received 13 December 2020
  • Accepted 17 March 2021

DOI:https://doi.org/10.1103/PhysRevC.103.044901

©2021 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Taesoo Song1,*, Laura Tolos2,3,4,†, Joana Wirth5,‡, Joerg Aichelin6,4,§, and Elena Bratkovskaya1,7,∥

  • 1GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, 64291 Darmstadt, Germany
  • 2Institute of Space Sciences (ICE, CSIC), Campus Universitat Autonoma de Barcelona, Carrer de Can Magrans, 08193 Bellaterra, Spain
  • 3Institut d'Estudis Espacials de Catalunya (IEEC), 08034 Barcelona, Spain
  • 4Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438 Frankfurt am Main, Germany
  • 5Excellence Cluster “Origin and Structure of the Universe” and Physik Department E62, Technische Universität München, 85748 Garching, Germany
  • 6SUBATECH UMR 6457 (IMT Atlantique, Université de Nantes, IN2P3/CNRS), 4 Rue Alfred Kastler, F-44307 Nantes, France
  • 7Institute for Theoretical Physics, Johann Wolfgang Goethe Universität, Frankfurt am Main, Germany

  • *t.song@gsi.de
  • tolos@ice.csic.es
  • joana.wirth@tum.de
  • §aichelin@subatech.in2p3.fr
  • e.bratkovskaya@gsi.de

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 103, Iss. 4 — April 2021

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×