0 Strangeness Enhancement in Heavy Ion Collisions – Evidence for Quark - Gluon - Matter ? ∗
نویسندگان
چکیده
The centrality dependence of (multi-)strange hadron abundances is studied for Pb(158AGeV)Pb reactions and compared to p(158GeV)Pb collisions. The microscopic transport model UrQMD is used for this analysis. The predicted Λ/π−, Ξ−/π− and Ω−/π− ratios are enhanced due to rescattering in central Pb-Pb collisions as compared to peripheral Pb-Pb or p-Pb collisions. However, the enhancement is substantially smaller than observed experimentally. The enhancement depends strongly on the kinematical cuts. The maximum enhancement is predicted around midrapidity. For Λ’s, strangeness ∗supported by DFG, BMBF, Graduiertenkolleg ’Theoretische und Experimentelle Schwerionenphysik’, Josef Buchmann Stiftung, and Alexander von Humboldt-Stiftung. S. A. B. is supported in part by DOE grant DE-FG02-96ER40945
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