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Are we close to the QGP? - Hadrochemical vs. microscopic analysis of particle production in ultrarelativistic heavy ion collisions

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arxiv nucl-th/9711032 v1 pith:3HTLBI6Y submitted 1997-11-18 nucl-th hep-ph

Are we close to the QGP? - Hadrochemical vs. microscopic analysis of particle production in ultrarelativistic heavy ion collisions

classification nucl-th hep-ph
keywords collisionsdatahadronicmicroscopicratiosabundancesagreeanalysis
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Ratios of hadronic abundances are analyzed for pp and nucleus-nucleus collisions at sqrt(s)=20 GeV using the microscopic transport model UrQMD. Secondary interactions significantly change the primordial hadronic cocktail of the system. A comparison to data shows a strong dependence on rapidity. Without assuming thermal and chemical equilibrium, predicted hadron yields and ratios agree with many of the data, the few observed discrepancies are discussed.

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