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Upper limit for thermal direct photon production in heavy-ion collisions at 60 and 200A·GeV

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Zeitschrift für Physik C Particles and Fields

Abstract

The production of direct photons has been investigated in reactions ofp and16O projectiles at 60 and 200A·GeV with C and Au nuclei. Photon and π0 spectra have been measured in the pseudorapidity range 1.5≦η≦2.1 for the transverse momentum region 0.4 GeV/c≦p T ≦2.8 GeV/c employing the lead-glass spectrometer SAPHIR. An upper limit of 15% at the 90% confidence level for the direct photon signal relative to the neutral pion production is obtained from the comparison of measured photon spectra with Monte Carlo simulations of the hadronic background based on the reconstructed yield of π0 and η mesons. Consequences for a possible phase transition to a quark-gluon plasma are discussed.

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Author notes

  1. P. Beckmann & H. Löhner

    Present address: KVI, University of Groningen, NL-9747 AA, Groningen, Netherlands

  2. A. Franz, F. E. Obenshain & S. P. Sørensen

    Present address: University of Tennessee, 37996, Knoxville, TN, USA

Authors and Affiliations

  1. Gesellschaft für Schwerionenforschung (GSI), W-6100, Darmstadt, Federal Republic of Germany

    R. Albrecht, R. Bock, H. H. Gutbrod, B. W. Kolb, I. Lund & H. R. Schmidt

  2. Lawrence Berkeley Laboratory, 94720, Berkeley, CA, USA

    P. Jacobs, A. M. Poskanzer & H. G. Ritter

  3. University of Lund, S-22362, Lund, Sweden

    G. Claesson, A. Eklund, S. Garpman, H. Å. Gustafsson, J. Idh, P. Kristiansson, A. Oskarsson, I. Otterlund & E. Stenlund

  4. University of Münster, W-4400, Münster, Federal Republic of Germany

    P. Beckmann, F. Berger, D. Bock, G. Clewing, L. Dragon, R. Glasow, G. Hölker, K. H. Kampert, H. Löhner, T. Peitzmann, M. Purschke, R. Santo, K. Steffens & D. Stüken

  5. Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA

    T. C. Awes, R. L. Ferguson, F. E. Obenshain, F. Plasil, S. Saini, S. P. Sørensen, M. Tincknell & G. R. Young

Authors
  1. R. Albrecht
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  2. T. C. Awes
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  5. D. Bock
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  41. G. R. Young
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WA 80 Collaboration., Albrecht, R., Awes, T.C. et al. Upper limit for thermal direct photon production in heavy-ion collisions at 60 and 200A·GeV. Z. Phys. C - Particles and Fields 51, 1–10 (1991). https://doi.org/10.1007/BF01579555

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  • DOI: https://doi.org/10.1007/BF01579555

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