V. Friese for the Na49 Collaboration

Multiplicity fl uctuations in nuclear collisions at 158A GeV

C. Alt, C. Blume, P. Dinkelaker, D. Flierl, V. Friese, M. Gaździcki, C. Höhne, S. Kniege, M. Kliemant, B. Lungwitz, M. Mitrovski, M. Otto, R. Renfordt, A. Sandoval, T. Schuster, R. Stock, C. Strabel, H. Ströbele for the NA49 Collaboration and E. Bratkovskaya and M. Gorenstein for the HSD and UrQMD Collaboration Fachbereich Physik der Universität Frankfurt, GSI Darmstadt, Frankfurt Institute for...

Recent Na49 Results on Pb+pb Collisions at Cern Sps Ferenc Siklér for the Na49 Collaboration

Pion and kaon production in A+A collisions at low SPS energies

The results from the NA49 energy scan programme at the SPS have revealed an anomalous behavior of the energy dependence of the 〈K+〉/〈π+〉 ratio in central Pb+Pb collisions [1] which is absent in p+p interactions. Here we report the results on charged kaon and pion production in central collisions at 20 and 30 A·GeV as well as their system size dependence at 40 A·GeV. The former data extend the e...

Multistrange Particles in Nuclear Collisions at SPS energies

The NA49 collaboration has taken high statistics data of Pb+Pb collisions at the CERN SPS in the energy range from 20 to 158 A·GeV. This contribution covers the production of the multistrange baryons Ξ and Ω at 40 and 158 A·GeV[1, 2]. Identification of these multistrange baryons proceeds via their weak decays into a Λ hyperon and a negatively charged pion (kaon) for the Ξ− (Ω−). In a first step...

Energy dependence of strangeness production

We present a summary of strange particle yields measured by the experiment NA49 in central Pb+Pb collisions in the beam energy range 20 158 AGeV. The comparison with thermal hadron model results shows that above 30 AGeV, a strangeness undersaturation parameter γS must be employed to describe the data. This suggests a change in the strangeness production mechanism at this energy. We find that th...