Dilepton Spectra in Heavy Ion Collisions

  • Jean Letessier
  • Johann Rafelski
  • Ahmed Tounsi
Part of the NATO ASI Series book series (NSSB, volume 346)


The theoritical study1, 2 of the deconfined, dense hadronic matter produced in the relativistic collisions has shown that in the present day experiments a relatively high initial value for the light quark-gluon chemical equilibrium temperature is reached, namely T ch = 280 MeV in the S-W/Pb case at 200 GeV A. In the forthcoming Pb-Pb experiments at 160 GeV A we expect still a higher value: T ch = 324 MeV. At pre-chemical equilibrium even higher temperature values should be present — we recall that the production of the strange quark flavor acts to cool the system to the ‘observable’ chemical equilibrium temperature values which are about 50 MeV lower. We believe that these relatively high pre-strangeness temperatures can be observed studying the dilepton invariant mass spectra.


Invariant Mass Hadronic Phase Hadron Contribution Transverse Expansion Dilepton Signal 
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  1. 1.
    J. Letessier, A. Tounsi, U. Heinz, J. Sollfrank and J. Rafelski, Phys. Rev. Lett. 70 (1993) 3530. Strangeness Conservation in hot nuclear fireballs, Paris preprint LPTHE/92-27R, submitted to Phys. Rev. D. ADSCrossRefGoogle Scholar
  2. U. Heinz, Nucl. Phys. A566 (1994) 205c.ADSGoogle Scholar
  3. J. Rafelski, J. Letessier and A. Tounsi, in Proceedings of the XXVI International Conference on High Energy Physics, Dallas, Texas, 1992, AIP Conference Proceedings No 272, 983, J.R. Sanford, Editor.Google Scholar
  4. 2.
    J. Letessier, J. Rafelski and A. Tounsi, Phys. Rev. Lett. B333 (1994) 484–493. J. Letessier, J. Rafelski, and A. Tounsi, in this volume.ADSGoogle Scholar
  5. 3.
    J. Letessier and A. Tounsi, Phys. Rev. D40 (1989) 2914.ADSGoogle Scholar
  6. 4.
    M. Kataja, J. Letessier, P.V. Ruuskanen and A. Tounsi, Z. Physik C55 (1992) 153.ADSGoogle Scholar
  7. 5.
    L. D. Landau and E. M. Lifshitz, Fluid Mechanics Pergamon Press, Oxford, 1959.Google Scholar
  8. 6.
    A. Tounsi, J. Letessier and J. Rafelski, in this volume.Google Scholar
  9. 7.
    M.A. Mazzoni (Helios3 collaboration), Nucl. Phys. A566 (1994) 95c.ADSGoogle Scholar
  10. 8.
    E.V. Shuryak and L. Xiang, Where the Excess Photons and Dileptons in SPS Nuclear Collisions Come from? Stony Brook preprint SUNY-NTG-94-14, March 1994.Google Scholar
  11. 9.
    O. Drapier, in this volume.Google Scholar

Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • Jean Letessier
    • 1
  • Johann Rafelski
    • 1
    • 2
  • Ahmed Tounsi
    • 1
  1. 1.Laboratoire de Physique Théorique et Hautes EnergiesUniversité Paris 7Paris Cedex 05France
  2. 2.Department of PhysicsUniversity of ArizonaTucsonUSA

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