6533b7ddfe1ef96bd1273e06
RESEARCH PRODUCT
Sensitivity of electromagnetic spectra to equation of state and initial energy density in the Pb+Pb collisions at SPS
P.v. RuuskanenJosef SollfrankPasi Huovinensubject
PhysicsNuclear and High Energy PhysicsEquation of stateNuclear TheoryHadronNuclear TheoryFOS: Physical sciencesSpectral lineNuclear Theory (nucl-th)Nuclear physicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)ThermalMass spectrumRapidityNuclear ExperimentOrder of magnitudeLeptondescription
We study Pb+Pb collisions at 158 A GeV/c using a hydrodynamical approach. We test different equations of state (EoSs) and different initial conditions and show that there are more than one initial state for each EoS which reproduce the observed hadronic spectra. We also find that different equations of state favour different freeze-out temperature. Simultaneously we calculate the thermal dilepton and photon spectra for each EoS and initial state. We compare the dilepton mass spectrum to data measured by the CERES collaboration and find that the differences in spectra obtained using different EoSs and initial states are not resolvable within the current experimental resolution. However, at invariant masses over 2 GeV the difference in the yield due to various initial states is close to an order of magnitude. We also study the rapidity distribution of lepton pairs and find that for masses around 800 MeV the shape of the distribution depends strongly on the EoS.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1998-07-29 |