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Single photons from Pb + Pb collisions at CERN SPS, QGP versus hadronic gas

In a hydrodynamic model, we have analysed the direct photon data obtained by the WA98 collaboration in 158 A GeV Pb+Pb collisions at CERN SPS. The transverse expansion of the system was taken into account. Two scenarios (i) formation of quark-gluon plasma and (ii) formation of hot hadronic gas were...

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Autor principal: Chaudhuri, A.K.
Lenguaje:eng
Publicado: 2000
Materias:
Acceso en línea:https://dx.doi.org/10.1088/0954-3899/29/2/301
http://cds.cern.ch/record/480990
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author Chaudhuri, A.K.
author_facet Chaudhuri, A.K.
author_sort Chaudhuri, A.K.
collection CERN
description In a hydrodynamic model, we have analysed the direct photon data obtained by the WA98 collaboration in 158 A GeV Pb+Pb collisions at CERN SPS. The transverse expansion of the system was taken into account. Two scenarios (i) formation of quark-gluon plasma and (ii) formation of hot hadronic gas were considered. Equally well description to the data were obtained in both the scenarios. However, hadronic gas scenario require very high initial temperature ($\sim$ 300 MeV) and it is difficult to conceive existence of hadron gas at that high temperature. If the hadronic fluid has small radial velocity (0.2c-0.3c) initially, the data are well explained in the hadronic gas scenario with reasonable initial temperatures.
id cern-480990
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2000
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spelling cern-4809902020-03-13T11:24:10Zdoi:10.1088/0954-3899/29/2/301http://cds.cern.ch/record/480990engChaudhuri, A.K.Single photons from Pb + Pb collisions at CERN SPS, QGP versus hadronic gasNuclear Physics - TheoryIn a hydrodynamic model, we have analysed the direct photon data obtained by the WA98 collaboration in 158 A GeV Pb+Pb collisions at CERN SPS. The transverse expansion of the system was taken into account. Two scenarios (i) formation of quark-gluon plasma and (ii) formation of hot hadronic gas were considered. Equally well description to the data were obtained in both the scenarios. However, hadronic gas scenario require very high initial temperature ($\sim$ 300 MeV) and it is difficult to conceive existence of hadron gas at that high temperature. If the hadronic fluid has small radial velocity (0.2c-0.3c) initially, the data are well explained in the hadronic gas scenario with reasonable initial temperatures.In a hydrodynamic model, we have analysed the direct photon data obtained by the WA98 collaboration in 158 A GeV Pb+Pb collisions at CERN SPS. The transverse expansion of the system was taken into account. Two scenarios (i) formation of quark-gluon plasma and (ii) formation of hot hadronic gas were considered. Equally well description to the data were obtained in both the scenarios. However, hadronic gas scenario require very high initial temperature ($\sim$ 300 MeV) and it is difficult to conceive existence of hadron gas at that high temperature. If the hadronic fluid has small radial velocity (0.2c-0.3c) initially, the data are well explained in the hadronic gas scenario with reasonable initial temperatures.nucl-th/0012058oai:cds.cern.ch:4809902000-12-15
spellingShingle Nuclear Physics - Theory
Chaudhuri, A.K.
Single photons from Pb + Pb collisions at CERN SPS, QGP versus hadronic gas
title Single photons from Pb + Pb collisions at CERN SPS, QGP versus hadronic gas
title_full Single photons from Pb + Pb collisions at CERN SPS, QGP versus hadronic gas
title_fullStr Single photons from Pb + Pb collisions at CERN SPS, QGP versus hadronic gas
title_full_unstemmed Single photons from Pb + Pb collisions at CERN SPS, QGP versus hadronic gas
title_short Single photons from Pb + Pb collisions at CERN SPS, QGP versus hadronic gas
title_sort single photons from pb + pb collisions at cern sps, qgp versus hadronic gas
topic Nuclear Physics - Theory
url https://dx.doi.org/10.1088/0954-3899/29/2/301
http://cds.cern.ch/record/480990
work_keys_str_mv AT chaudhuriak singlephotonsfrompbpbcollisionsatcernspsqgpversushadronicgas