NA49 Energy Scan Results for Central Lead-Lead Collisions at the CERN SPS

Abstract

The energy dependence of hadron production in central Pb-Pb collisions at SPS energies is presented and compared with data at lower and higher energies and with results from p-p interactions. It is observed that there is little change in transverse activity in the SPS energy range, that there is a steepening rate of increase of pion production and that the K+/pi+ ratio exhibits a sharp peak located at about 30 AGeV. The Lambda/pi ratio also shows a pronounced maximum which is weaker in Ksi/pi and absent in Omega/pi.Comment: To appear in the proceedings of the 39th Rencontres de Moriond on QCD and High-Energy Hadronic Interactions, La Thuile, March 28 - April 4, 200