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HK: Physik der Hadronen und Kerne

HK 33: Heavy Ions IV

HK 33.3: Vortrag

Mittwoch, 13. März 2002, 14:30–14:45, E

Energy Dependence of Kaon and Pion Production in Central Pb+Pb Collisions — •Roland Bramm¹, L. Betev², C. Blume³, P. Buncic², P. Dinkelaker², M. Gazdzicki², T. Kollegger², I. Kraus³, A. Mischke³, R. Renfordt², A. Sandoval³, R. Stock², H. Ströbele², D. Vranic³, A. Wetzler², and J. Zaranek² — ¹CERN, Genève — ²IKF, Universität Frankfurt — ³GSI, Darmstadt

The experiment NA49 investigates pion and kaon production in central Pb+Pb collisions at CERN-SPS energies (20-158 AGeV). The pion spectra are obtained from the analysis of distributions of all negatively charged hadrons. The kaon spectra are acquired using the particle identification based on the analysis of the specific energy loss (dE/dx) and in the midrapidity region via the analysis of the time of flight data (ToF). Rapidity and transverse momentum spectra at 40, 80 and 158 AGeV will be presented. A transition from a No-dqpion suppressionNo-dq to a No-dqpion enhancementNo-dq compared to the p+p data at a collision energy around 40 AGeV is observed. The K+ to pi+ ratio shows a non-monotonic behaviour with a maximum located close to 40 AGeV. A comparison with models is included.