Abstract
In this talk we discuss the effects of the hadronic rescattering on final state observables in high energy nuclear collisions. We do so by employing the UrQMD transport model for a realistic description of the hadronic decoupling process. The rescattering of hadrons modifies every hadronic bulk observable. For example apparent multiplicity of resonances is suppressed as compared to a chemical equilibrium freeze-out model. Stable and unstable particles change their momentum distribution by more than 30% through rescattering. The hadronic rescattering also leads to a substantial decorrelation of the conserved charge distributions. These findings show that it is all but trivial to conclude from the final state observables on the properties of the system at an earlier time where it may have been in or close to local equilibrium.
Highlights
Introduction described with the relativisticBoltzmann equationThe aim of ultrarelativistic heavy ion experiments at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) is is the study of the properties of the socalled quark gluon plasma (QGP) which is created for a short time in these reactions [1,2,3,4,5]
These findings show that it is all but trivial to conclude from the final state observables on the properties of the system at an earlier time where it may have been in or close to local equilibrium
1 Introduction described with the relativistic Boltzmann equation: The aim of ultrarelativistic heavy ion experiments at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) is is the study of the properties of the socalled quark gluon plasma (QGP) which is created for a short time in these reactions [1,2,3,4,5]
Summary
The aim of ultrarelativistic heavy ion experiments at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) is is the study of the properties of the socalled quark gluon plasma (QGP) which is created for a short time in these reactions [1,2,3,4,5] This includes the determination of the yet unknown transport properties of QCD matter as well as the study of its phase structure at large net baryon densities. Several studies have pointed out the importance of the hadronic rescattering, during the freeze-out phase of a nuclear reaction, on the description of observables like particle numbers and spectra, resonance production, momentum anisotropies and particle number fluctuations [16,17,18,19] This talk will give a summary of how the hadronic interactions affect the final state observables. The probabilities of certain reactions do depend on the magnitude of the cross section and on the phase space densities of the involved hadrons, making the microscopic description of the hadronic phase so important
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