Darmstadt 2008 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 27: Physik mit schweren Ionen
HK 27.2: Talk
Tuesday, March 11, 2008, 11:30–11:45, 2E
Isospin effects on meson production in heavy ion collisions — Vaja Prassa1, Theodoros Gaitanos2, Graziella Ferini3, Massimo Di Toro3, Georgios Lalazissis1, and •Hermann Wolter4 — 1Dep. of Theoretical Physics, Aristotle University, Thessaloniki, Greece — 2Institut für Theoretische Physik, Universität Gießen, Germany — 3Lab. Naz. del Sud (LNS), INFN, Catania, Italy — 4Fak. für Physik, Universität München, Germany
The properties of mesons (kaons and pions) in compressed hadronic matter
as existing in intermediate energy heavy-ion collisions are studied within a
fully covariant transport approach of a Vlasov-Boltzmann type. The
role of different models of kaon potentials in isospin-asymmetric matter
and of in-medium modifications of the nucleon-nucleon cross section
on the pion and kaon dynamics is investigated. It is found that pion
observables are moderately affected by in-medium reduced cross sections.
E.g. we find that the trend of pion flow to antiflow with decreasing centrality is reproduced. On the
other hand, the different isospin-states of the kaon (K0,+) are
substantially changed by in-medium effects. However, their ratio remains
robust against density modifications of the cross sections and of the kaon
potentials. This finding is important in the attempt of determining the isovector equation-of-state
from strangeness production in nucleus-nucleus collisions.
Work supported by BMBF, the
European Union Social Fund, the State Scholarship Foundation (I.K.Y.), and the
National Fund Pythagoras II-EPEAEK II, Greece.