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Centrality dependence of K+ produced in Pb+Pb collisions at 158 GeV per nucleon

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arxiv hep-ex/0010045 v1 pith:QI3CQNSZ submitted 2000-10-18 hep-ex

NA52 collaboration: R. Arsenescu , H. P. Beck , K. Borer , S. Kabana , R. Klingenberg , G. Lehmann , R. Mommsen , U. Moser
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K. Pretzl J. Schacher R. Spiwoks M. Weber K. Elsener K. D. Lohmann C. Baglin A. Bussiere J. P. Guillaud T. Lindén J. Tuominiemi Ph. Gorodetzky
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keywords abovebehaviourcentralitycollisionsdatadependencediscontinuousna52
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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.

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