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Titolo:
Sensitivity of electromagnetic spectra to equation of state and initial energy density in the Pb+Pb collisions at SPS
Autore:
Huovinen, P; Ruuskanen, PV; Sollfrank, J;
Indirizzi:
Univ Jyvaskyla, Dept Phys, Jyvaskyla, Finland Univ Jyvaskyla Jyvaskyla Finland vaskyla, Dept Phys, Jyvaskyla, Finland Univ Regensburg, Inst Theoret Phys, D-8400 Regensburg, Germany Univ Regensburg Regensburg Germany D-8400 ys, D-8400 Regensburg, Germany
Titolo Testata:
NUCLEAR PHYSICS A
fascicolo: 2, volume: 650, anno: 1999,
pagine: 227 - 244
SICI:
0375-9474(19990412)650:2<227:SOESTE>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEAVY-ION COLLISIONS; NUCLEUS-NUCLEUS COLLISIONS; SUPER PROTON SYNCHROTRON; HADRON PHASE-TRANSITION; QUARK-GLUON PLASMA; MASS DILEPTON PRODUCTION; THERMAL PHOTON-EMISSION; PB-AU COLLISIONS; S+AU COLLISIONS; 200A GEV;
Keywords:
ultrarelativistic heavy-ion collisions; hydrodynamical description; electromagnetic spectra;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Huovinen, P Univ Jyvaskyla, Dept Phys, Jyvaskyla, Finland Univ Jyvaskyla Jyvaskyla Finland t Phys, Jyvaskyla, Finland
Citazione:
P. Huovinen et al., "Sensitivity of electromagnetic spectra to equation of state and initial energy density in the Pb+Pb collisions at SPS", NUCL PHYS A, 650(2), 1999, pp. 227-244

Abstract

We study Pb + Pb collisions at 158A 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 favor 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 massesaround 800 MeV the shape of the distribution depends strongly on the EoS, (C) 1999 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 09:52:13