Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 21: Heavy Ions II
HK 21.1: Gruppenbericht
Dienstag, 9. März 2004, 15:30–16:00, F
Do we see an onset of deconfinement at SPS energies ? — •D. Flierl1, C. Alt1, C. Blume1, P. Buncic1, P. Dinkelaker1, V. Friese2,3, M. Gazdzicki1, M. Kliemant1, S. Kniege1, I. Kraus2, B. Lungwitz1, C. Meurer1, M. Mitrovski1, S. Radomski2, R. Renfordt1, A. Richard1, A. Sandoval2, R. Stock1, and H. Ströbele1 — 1Institut für Kernphysik, Universität Frankfurt — 2Gesellschaft für Schwerionenforschung (GSI), Darmstadt — 3Fachbereich Physik der Universität, Marburg
In the course of the energy scan programme at the CERN SPS
the NA49 experiment has measured the hadronic final state of Pb+Pb
collisions at 20,30,40,80 and 160 AGeV beam energy.
Several observables indicate the onset of a phase transition
at lower SPS energies.
For example, the K+ to π+ ratio - which is closely
related to the strangeness over entropy ratio - shows in Pb+Pb
collisions a maximum at 20-30 AGeV.
In statistical model calculations,
such a dependence is characteristic for the creation
of a plasma phase.
We will summarize the excitation functions of pion multiplicity,
K+ to π+ ratio, average transverse momentum,
and event by event fluctuations.