Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 13: Physik mit schweren Ionen

HK 13.5: Vortrag

Dienstag, 13. März 2007, 15:15–15:30, F

Energy dependence of K_S⁰ production in central Pb+Pb collisions at the CERN SPS — •Claudia Strabel¹, Christopher Alt¹, Alexandra Argyrakis¹, Christoph Blume¹, Peter Dinkelaker¹, Volker Friese², Marek Gazdzicki¹, Claudia Höhne², Michael Kliemant¹, Stefan Kniege¹, Dmytro Kresan², Benjamin Lungwitz¹, Michael Mitrovski¹, Rainer Renfordt¹, Tim Schuster¹, Reinhard Stock¹, Herbert Ströbele¹, Millica Utvic¹, and Alexander Wetzler¹ for the NA49 collaboration — ¹Fachbereich Physik der Universität Frankfurt — ²Gesellschaft für Schwerionenforschung (GSI), Darmstadt

The NA49 experiment at the CERN SPS has collected data on central Pb+Pb collisions in the beam energy range 20A-158A GeV. One of the most striking observations is the pronounced maximum in the ratio of the strangeness to pion yield at low SPS energies. In order to cross-check these results and to complete the analysis of strange particles, the K_S⁰ production was studied. K_S⁰ were identified via decay topology and invariant mass determination.

Recent results on K_S⁰ production in central Pb+Pb collisions will be discussed for 30A, 40A and 158A GeV. Preliminary transverse mass spectra, rapidity spectra as well as the total yields will be presented and compared to models and the corresponding results for charged kaons. Furthermore, a comparison to K_S⁰ results of the CERES and the NA57 experiment will be shown. Additionally, the kaon-to-pion ratio will be compared to data obtained at AGS and RHIC energies.