Baryon-Strangeness Correlations from HadronString- and Quark

Baryon-strangeness correlations ($C_{BS}$) are studied with a hadron/string transport approach (UrQMD) and a dynamical quark recombination model (quark molecular dynamics, qMD) for various energies from $E_{lab}=4A$ GeV to $\sqrt{s_{NN}}=200$ GeV. As expec

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aBaryon-StrangenessHadron/String-andCorrelationsQuark-DynamicsfromStephaneHaussler ,StefanScherer andMarcusBleicher FrankfurtInstituteforAdvancedStudies(FIAS),JohannWolfgangGoetheUniversität, Max-von-Laue-Str.1,60438FrankfurtamMain,GermanyInstitutfürTheoretischePhysik,JohannWolfgangGoetheUniversität,Max-von-Laue-Str.1,60438FrankfurtamMain,GermanyAbstract.Baryon-strangenesscorrelations(CandadynamicalquarkrecombinationBS)arestudiedwithahadron/stringtransportap-proach(UrQMD)forvariousenergiesfromElab=4AGeVto√model(quarkmoleculardynamics,qMD)

Baryon-strangeness correlations ($C_{BS}$) are studied with a hadron/string transport approach (UrQMD) and a dynamical quark recombination model (quark molecular dynamics, qMD) for various energies from $E_{lab}=4A$ GeV to $\sqrt{s_{NN}}=200$ GeV. As expec

BS B S CBS= 3

N∑nB(n)S(n) (1N∑nS(n))

N∑n(S(n))2 (1

Baryon-strangeness correlations ($C_{BS}$) are studied with a hadron/string transport approach (UrQMD) and a dynamical quark recombination model (quark molecular dynamics, qMD) for various energies from $E_{lab}=4A$ GeV to $\sqrt{s_{NN}}=200$ GeV. As expec

FIGURE1.Correlationcoef cientCBSforcentralAu+Au/Pb+PbasafunctionofsNN=200GeVasshowninFig.2.Atearly

timesoneobservesthatCBS≈1,inagreementwiththeexpectationsforaquark-gluon-plasma.However,around6fm/c(whenthehadronizationstarts)CBSdecreasesstronglyandreachesits nalvalueCBS≈0.6 0.7.OneshouldnotethatthereisnohadronicrescatteringstageinqMD,thus,thedecreaseofthecorrelationissolelyrelatedtothe

Baryon-strangeness correlations ($C_{BS}$) are studied with a hadron/string transport approach (UrQMD) and a dynamical quark recombination model (quark molecular dynamics, qMD) for various energies from $E_{lab}=4A$ GeV to $\sqrt{s_{NN}}=200$ GeV. As expec

FIGURE2.√lisionsatCorrelationcoef cientfromthequarkmoleculardynamicscalculationforAu+Aucol-

sNN=200GeVforcentral

Au+Au/Pb+Pbreactionswithtwodifferentmodels.TheUrQMDmodelisbasedonstring-hadronicdegreesoffreedom,whereastheqMDmodelcontainsanexplicitquarkphaseandatransitionfromquarktohadronicmatter.CBSisfoundtodecreasefromthelowerenergiestowardsthetopRHICenergyinbothapproaches.AtthehighestRHICenergytheCBSvaluefromthehadron/stringtransportmodelisroughlyhalftheoneexpectedinthecaseofaQGP.However,thecalculationincludingaphasetransitiongivessimilarresultsaswithoutphasetransition,inclearcontradictionwithwhathasbeenexpectedincaseaplasmaofquarksandgluonsastheinitialmatter.This ndingistracedbacktothehadronizationprocessitselfthatdestroystheinitiallypresentcorrelations.

ACKNOWLEDGMENTS

ThisworkhasbeensupportedbyGSIandBMBF.ThecomputationalresourceswereprovidedbytheCenterforScienti cComputing(CSC)inFrankfurt.

Baryon-strangeness correlations ($C_{BS}$) are studied with a hadron/string transport approach (UrQMD) and a dynamical quark recombination model (quark molecular dynamics, qMD) for various energies from $E_{lab}=4A$ GeV to $\sqrt{s_{NN}}=200$ GeV. As expec

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