Distinguishing Hadronic Cascades from Hydrodynamic Models in Pb(160 AGeV)+Pb Reactions by I.pdfVIP

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2017-04-09 发布于江苏
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Distinguishing Hadronic Cascades from Hydrodynamic Models in Pb(160 AGeV)+Pb Reactions by I.pdf

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DistinguishingHadronicCascadesfromHydrodynamicModelsinPb(160AGeV)PbReactionsbyI

a r X i v : h e p - p h / 9 8 1 1 4 5 9 v 1 2 4 N o v 1 9 9 8 Distinguishing Hadronic Cascades from Hydrodynamic Models in Pb(160 AGeV)+Pb Reactions by Impact Parameter Variation M. Bleichera,e, M. Reitera, A. Dumitrub,g, J. Brachmanna, C. Spielesc,f , S.A. Bassd,f , H. Sto?ckera, W. Greinera a Institut fu?r Theoretische Physik, J. W. Goethe-Universita?t, 60054 Frankfurt am Main, Germany b Department of Physics, Yale University, New Haven, Connecticut, USA c Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA d Department of Physics, Duke University, Durham, N.C. 27708-0305, USA Abstract We propose to study the impact parameter dependence of the Λ/p ratio in Pb(160AGeV)+Pb reactions. The Λ/p ratio is a sensible tool to distinguish between hadronic cascade models and hydrodynamical models, which incor- porate a QGP phase transition. E-mail: bleicher@th.physik.uni-frankfurt.de e Fellow of the Josef Buchmann Foundation f Feodor Lynen Fellow of the Alexander v. Humboldt Foundation g Supported by a postdoctoral fellowship of the Deutscher Akademischer Austauschdienst (DAAD) 1 Hadron abundances and ratios have been suggested as possible signatures for exotic states and phase transitions in hot and dense nuclear matter. Bulk properties like temperatures, entropies and chemical potentials of highly excited hadronic matter have been extracted from high energy heavy ion data assuming thermal and chemical equilibrium [1–4]. How- ever, unambiguous signals of a phase transition into an equilibrated deconfined quark gluon plasma (QGP) state are still missing: the predicted change in observables, e.g. strangeness enhancement [4], may also be understood in hadronic non-equilibrium transport models [5]. In this letter, the variation of the Λ/p ratio1 as a function of the impact parameter b in Pb(160 AGeV)+Pb reactions is proposed as a method to distinguish equilibrium from non-equilibrium scenarios. In models based on the assumption of local