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HK: Physik der Hadronen und Kerne
HK 6: Heavy Ions I
HK 6.2: Gruppenbericht
Montag, 11. März 2002, 16:45–17:15, E
Excitation Function of Λ and charged K Production at CERN-SPS Energies* — •André Mischke1,2, L. Betev2, A. Billmeier1,2, C. Blume1, R. Bramm2, P. Buncic2, P. Dinkelacker2, M. Gaździcki2, T. Kollegger2, I. Kraus1,2, C. Markert1,2, R. Renfordt2, A. Sandoval1,2, R. Stock2, H. Ströbele1,2, D. Vranic 2, A. Wetzlar2, and J. Zaranek 2 — 1GSI, Planckstrasse 1, D-64291 Darmstadt — 2Institut f. Kernphysik, August Eulerstr.6, D-60486 Frankfurt
Within the framework of the NA49 energy scan program,
Λ hyperons and charged Kaons were measured in central
208Pb+208Pb collisions at 40, 80 and 158 A·GeV
with a large acceptance hadron spectrometer over a large
range of rapidity and transverse momentum.
Neutral strange hadrons Λ, Λ and Ks0
are identified by reconstructing their decay topologies.
The charged decay products as well as the charged Kaons
were measured with 4 Time Projection Chambers (TPCs),
two of them are located inside 2 large dipole magnets,
the other two downstream of the magnets symmetrically
to the beam line.
Transverse mass spectra and rapidity distributions for Λ
and charged Kaons will be shown for all three energies. The
multiplicities at mid-rapidity and the total yields will be
studied as a function of collision energy together with AGS and RHIC
measurements and compared with model predictions.
The ratio Λ/π as well as K+/π+ shows a
non-monotonic energy dependence and has a maximum between top
AGS and 40 A·GeV.
*Supported by BMBF und GSI.