Advertisement

Measurement of Direct Photons in 200·A GeV 32S+Au Collisions

  • F. Plasil

Abstract

Two years ago at the 10th Winter Workshop on Nuclear Dynamics, we reported preliminary results from our measurements of photons in reactions of 200·A GeV 32S ions with Au nuclei.1 The results had been presented earlier at Quark Matter ’93.2 For central collisions we reported a small, but statistically significant, excess of photons over those that can be accounted for by the two-photon decay branches of π0 and η mesons and by the small photon contributions from other radiative decays. This paper is, in a sense, a sequel to the 1994 presentation. Here we present the final WA80 single “direct” photon results,3 and we discuss their implications for various theoretical calculations.

Keywords

Transverse Momentum Quark Matter Central Collision Direct Photon Photon Yield 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    F. Plasil et al., Proceedings 10th Winter Workshop on Nuclear Dynamics, Snowbird, Utah, World Scientific Publishing, Singapore (1994), p. 119.Google Scholar
  2. 2.
    R. Santo et al., Nucl. Phys. A566: 61c (1994).Google Scholar
  3. 3.
    R. Albrecht et al., submitted to Physical Review Letters, Nov. 1995.Google Scholar
  4. 4.
    E. V. Shuryak, Yad. Phys. 28:796 (1978); [Soy. J. Nucl. Phys. 28:408 (1978)].Google Scholar
  5. 5.
    J. Kapusta, P. Lichard, and D. Seibert, Phys. Rev. D 44: 2774 (1991).Google Scholar
  6. 6.
    L. Xiong, E. Shuryak, and G. E. Brown, Phys. Rev. D 46: 3798 (1992).Google Scholar
  7. 7.
    E. V. Shuryak and L. Xiong, Phys. Lett. B 333: 316 (1994).Google Scholar
  8. 8.
    D. K. Srivastava and B. Sinha, Phys. Rev. Lett. 73: 2421 (1994).ADSCrossRefGoogle Scholar
  9. 9.
    J. J. Neumann, D. Siebert, and G. Fai, Phys. Rev. C 51: 1460 (1995).Google Scholar
  10. 10.
    A. Dumitru, U. Katscher, J. A. Maruhn, H. Stöcker, W. Greiner, and D. H. Rischke, Phys. Rev. C51: 2166 (1995).ADSGoogle Scholar
  11. 11.
    N. Arbex, U. Ornik, M. Plumer, A. Timmermann, and R. M. Weiner, Phys. Lett. B 354: 307 (1995).Google Scholar
  12. 12.
    R. Albrecht et al., Phys. Lett. B 361: 14 (1995).Google Scholar
  13. 13.
    P. W Stankus, private communication.Google Scholar
  14. 1.
    K. Werner, Physics Reports 232 (1993) 87 - 299ADSCrossRefGoogle Scholar
  15. 2.
    K. Werner, Nucl. Phys. A525 (1991) 501cADSCrossRefGoogle Scholar
  16. 3.
    N. Metropolis, A.W. Rosenbluth, M.N. Rosenbluth, A.H. Teller, and E. Teller, J. Chem. Phys. 21 (1953) 1087Google Scholar
  17. 4.
    Klaus Werner and Jörg Aichelin, Phys. Rev. C52 (1995) 1584Google Scholar
  18. 1.
    S. Date, M. Gyulassy and H. Sumiyoshi, Phys. Rev. D32: 619 (1985).ADSCrossRefGoogle Scholar
  19. 2.
    F. Videbaek et al., Nucl. Phys. A590: 249c (1995).Google Scholar
  20. 3.
    V. Blobel et al., Nucl. Phys. B69: 454 (1974).ADSCrossRefGoogle Scholar
  21. 4.
    T. Abbott et al., Phys. Rev. C50: 1024 (1994).MathSciNetADSGoogle Scholar
  22. 5.
    J. Barrette, et al. Phys. Rev. C50: 3047 (1994).ADSGoogle Scholar
  23. 6.
    J. Baechler et al., Phys. Rev. Lett. 72: 1419 (1994).ADSCrossRefGoogle Scholar
  24. 7.
    P. Seyboth, et al. Proc. of the XXV International Symposium on Multiparticle Dynamics, Stara Lesnia, Slovakia (1995).Google Scholar
  25. 8.
    H.H. Gutbrod et al., Z. Phys. A337: 57 (1990).ADSGoogle Scholar
  26. 9.
    T. Wienold and the EOS-TPC Collaboration, Annual Report of the Nuclear Science Division, Lawrence Berkeley National Laboratory Report (1996).Google Scholar
  27. 10.
    J. Dodd, et al., Proc. of the XXV International Symposium on Multiparticle Dynamics, Stara Lesnia, Slovakia (1995).Google Scholar
  28. 11.
    E.L. Feinberg, Z. Phys. C38: 229 (1988).Google Scholar
  29. 12.
    H. Sorge, et al., Phys. Lett. B243: 7 (1990).Google Scholar
  30. 13.
    A. von Keitz, et al., Phys. Lett. B263: 353 (1991).Google Scholar
  31. 14.
    II. Sorge, et al., Phys. Lett. B289: 6 (1992).Google Scholar
  32. 15.
    J. Aichelin and K. Werner, Phys. Lett. B300: 158 (1993).Google Scholar
  33. 16.
    M. Gyulassy and X.N. Wang, Nucl. Phys. B420: 583 (1994).ADSCrossRefGoogle Scholar
  34. 17.
    R. Baier, et al., Phys. Lett. B345: 277 (1995).Google Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • F. Plasil
    • 1
  1. 1.Physics DivisionOak Ridge National LaboratoryOak RidgeUSA

Personalised recommendations