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30. International Conference on High-Energy Physics ICHEP 2000, Osaka : Japon (2000)
Centrality dependence of $K^+$ produced in Pb+Pb collisions at 158 GeV per nucleon
R. Arsenescu, H. P. Beck, K. Borer, S. Kabana, R. Klingenberg, G. Lehmann, R. Mommsen, U. Moser, K. Pretzl, J. Schacher, R. Spiwoks, M. Weber, K. Elsener, K. D. Lohmann, C. Baglin1, A. Bussiere1, J.P. Guillaud1, T. Lindén, J. Tuominiemi, P. Gorodetzky2
NA52 Collaboration(s)

The NA52 collaboration searches for a discontinuous behaviour of charged kaons produced in Pb+Pb collisions at 158 A GeV as a function of the impact parameter, which could reveal a hadron to quark-gluon plasma (QGP) phase transition. The K+ yield is found to grow proportional to the number of participating ('wounded') nucleons N, above N=100. Previous NA52 data agree with the above finding and show a discontinuous behaviour in the kaon centrality dependence near N=100, marking the onset of strangeness enhancement -over e.g. p+A data at the same \sqrt{s}- in a chemically equilibrated phase.
1 :  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
2 :  PCC - Physique Corpusculaire et Cosmologie - Collège de France
Physique/Physique des Hautes Energies - Expérience
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