KAON FLOW IN HEAVY-ION COLLISIONS

Authors
Citation
Gq. Li et Cm. Ko, KAON FLOW IN HEAVY-ION COLLISIONS, Nuclear physics. A, 594(4), 1995, pp. 460-482
Citations number
82
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Nuclear
Journal title
ISSN journal
0375-9474
Volume
594
Issue
4
Year of publication
1995
Pages
460 - 482
Database
ISI
SICI code
0375-9474(1995)594:4<460:KFIHC>2.0.ZU;2-5
Abstract
Using the relativistic transport model that includes explicitly the ka on degree of freedom, we investigate kaon flow, i.e. the average kaon transverse momentum as a function of rapidity and the associated Bow p arameter in both Au+Au collisions at 1 GeV/nucleon and Ni+Ni collision s at 1.45 GeV/nucleon. We also study the proton and pion flows in thes e collisions. For the proton flow in Au+Au collisions, our results usi ng the non-linear sigma-omega model for the nucleon mean-field potenti al are in reasonable agreement with preliminary data from the EOS coll aboration, For pions, which are treated without a mean-field potential , we observe clearly a transition of their flow from being parallel to anti-parallel to the nucleon Bow when the two ions change from centra l to semi-central and peripheral collisions. For kaons, we use four di fferent assumptions for their potential in nuclear matter, i.e. withou t potential, the potential based on mean-field approximation to an eff ective chiral Lagrangian, the potential obtained in impulse approximat ion using the KN scattering length, and the potential containing only the repulsive vector interaction. It is found that the pattern of kaon flow in heavy-ion collisions is sensitive to the kaon potential used in the model and thus provides a useful means for studying kaon proper ties in nuclear medium.