6533b834fe1ef96bd129e2ec
RESEARCH PRODUCT
Hydrodynamical Description of 200 A GeV/c S+Au Collisions: Hadron and Electromagnetic Spectra
Raju VenugopalanMadappa PrakashMarkku KatajaPasi HuovinenJosef SollfrankP.v. Ruuskanensubject
PhysicsNuclear and High Energy PhysicsPhase transitionParticle physicsPhotonNuclear Theory010308 nuclear & particles physicsHadronNuclear TheoryDegrees of freedom (physics and chemistry)FOS: Physical sciencesOrder (ring theory)Nuclear matter01 natural sciencesSpectral lineNuclear Theory (nucl-th)Nuclear physics0103 physical sciencesQuark–gluon plasmaHigh Energy Physics::Experiment010306 general physicsNuclear Experimentdescription
We study relativistic S+Au collisions at 200 A GeV/c using a hydrodynamical approach. We test various equations of state (EOSs), which are used to describe the strongly interacting matter at densities attainable in the CERN-SPS heavy ion experiments. For each EOS, suitable initial conditions can be determined to reproduce the experimental hadron spectra; this emphasizes the ambiguity between the initial conditions and the EOS in such an approach. Simultaneously, we calculate the resulting thermal photon and dielectron spectra, and compare with experiments. If one allows the excitation of resonance states with increasing temperature, the electro-magnetic signals from scenarios with and without phase transition are very similar and are not resolvable within the current experimental resolution. With regard to the CERES dilepton data, none of the EOSs considered, in conjunction with the standard leading order dilepton rates, succeed in reproducing the observed excess of dileptons below the rho peak. Our work, however, suggests that an improved measurement of the photon and dilepton spectra has the potential to strongly constrain the EOS.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1996-07-16 |