Antistrange meson-baryon interaction in hot and dense nuclear matter

D. Cabrera, L. Tolós, J. Aichelin, and E. Bratkovskaya
Phys. Rev. C 90, 055207 – Published 17 November 2014

Abstract

We present a study of in-medium cross sections and (off-shell) transition rates for the most relevant binary reactions for strange pseudoscalar meson production close to threshold in heavy-ion collisions at energies available at the Facility for Antiproton and Ion Research. Our results rely on a chiral unitary approach in coupled channels which incorporates the s and p waves of the kaon-nucleon interaction. The formalism, which is modified in the hot and dense medium to account for Pauli blocking effects, mean-field binding on baryons, and pion and kaon self-energies, has been improved to implement unitarization and self-consistency for both the s- and the p-wave interactions at finite temperature and density. This gives access to in-medium amplitudes in several elastic and inelastic coupled channels with strangeness content S=1. The obtained total cross sections mostly reflect the fate of the Λ(1405) resonance, which melts in the nuclear environment, whereas the off-shell transition probabilities are also sensitive to the in-medium properties of the hyperons excited in the p-wave amplitudes [Λ,Σ, and Σ*(1385)]. The single-particle potentials of these hyperons at finite momentum, density, and temperature are also discussed in connection with the pertinent scattering amplitudes. Our results are the basis for future implementations in microscopic transport approaches accounting for off-shell dynamics of strangeness production in nucleus-nucleus collisions.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 10 June 2014
  • Revised 7 October 2014

DOI:https://doi.org/10.1103/PhysRevC.90.055207

©2014 American Physical Society

Authors & Affiliations

D. Cabrera1,2, L. Tolós2,3, J. Aichelin4, and E. Bratkovskaya1,2

  • 1Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität Frankfurt am Main, 60438 Frankfurt am Main, Germany
  • 2Frankfurt Institute for Advanced Studies (FIAS), 60438 Frankfurt am Main, Germany
  • 3Institut de Ciències de l'Espai (IEEC/CSIC), Campus Universitat Autònoma de Barcelona, Facultat de Ciències, Torre C5, E-08193 Bellaterra, Spain
  • 4Subatech, UMR 6457, IN2P3/CNRS, Université de Nantes, École des Mines de Nantes, 4 rue Alfred Kastler, 44307 Nantes cedex 3, France

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 90, Iss. 5 — November 2014

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
×