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NQMA-EXPERIMENTS-09 Recent results from the NA49 experiment

By C. Alt, C. Blume, P. Dinkelaker, D. Flierl, V. Friese, C. Höhne, S. Kniege, M. Kliemant, B. Lungwitz, M. Mitrovski, M. Otto, R. Renfordt, T. Schuster, R. Stock, C. Strabel, H. Ströbele and The Na Collaboration

Abstract

Energy dependence of hyperon production One of the most interesting results from the NA49 energy scan program at the CERN SPS is an anomalous behaviour of the energy dependence of the 〈K + 〉/〈π + 〉-ratio in central Pb+Pb reactions [1]. Also, results on the energy dependence of K −- φ-, Λ-, ¯ Λ-, and Ω-production have been reported [2, 3, 8]. The question whether all strange particles exhibit rapid changes in their yield relative to pions and what is the physics origin of these observed changes [4, 5], is of particular interest. In order to complete the picture, a systematic study of the Ξ-production as function of beam energy and system size has been started. Figure 1 shows a preliminary result for the Ξ −- and ¯ Ξ +-yield at mid-rapidity for the beam energies 20A, 30A, 40A, 80A, and 158A GeV, compared t

Year: 2010
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