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Soft photon production in 450 GeV/cp-Be collisions

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Zeitschrift für Physik C Particles and Fields

Abstract

We have measured the inclusivep T spectra of soft photons produced at central and backward rapidities in 450 GeV/cp-Be collisions down to 1 MeV/c in transverse momentum. In the region 1<p T <20 MeV/c an excess of photons over those expected from hadronic decays is observed. This excess is comparable, within systematic errors, with estimates of direct photons produced via hadronic bremsstrahlung. An upper limit is derived on the presence of additional sources of direct photons at small transverse momentum.

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Author notes

  1. J. Antos (Visitor)

    Present address: CERN from Slovak Academy of Sciences, CS-04353, Kosice, Czechoslovakia

  2. C. Erd (Visitor)

    Present address: CERN from Technical University of Vienna, A-1090, Vienna, Austria

Authors and Affiliations

  1. Brookhaven National Laboratory, 11973, Upton, NY, USA

    D. Lissauer, I. Stumer & C. Woody

  2. CERN, CH-1211, Geneva 23, Switzerland

    J. Antos (Visitor), H. Beker, K. Bussmann, C. Erd (Visitor), C. W. Fabjan, U. Goerlach, V. Hedberg, M. A. Mazzoni, J. Schukraft, R. J. Veenhof & W. J. Willis

  3. University of Heidelberg, D-69120, Heidelberg, Germany

    S. Brons, A. Drees, P. Glässel, M. Neubert, L. Olsen, A. Pfeiffer, J. Soltani & H. J. Specht

  4. Institute of Physics and Engineering, 115409, Moscow, Russia

    P. Nevski

  5. Oak Ridge National Laboratory, 37831-6369, Oak Ridge, TN, USA

    A. Ray & D. Shapira

  6. University of Pittsburgh, 15260, Pittsburgh, PA, USA

    J. Thompson

  7. Rutherford Appleton Laboratory, OX1 OQX, Didcot, UK

    N. A. McCubbin

  8. University of Tel Aviv, 9978, Ramat Aviv, Israel

    S. Dagan

  9. University College London, WC1E6BT, London, UK

    M. J. Esten

Authors
  1. J. Antos
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  2. H. Beker
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  3. S. Brons
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  4. K. Bussmann
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  5. S. Dagan
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  6. A. Drees
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  7. C. Erd
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  8. M. J. Esten
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  9. C. W. Fabjan
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  10. P. Glässel
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  11. U. Goerlach
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  12. V. Hedberg
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  13. D. Lissauer
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  14. M. A. Mazzoni
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  15. N. A. McCubbin
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  16. M. Neubert
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  17. P. Nevski
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  18. L. Olsen
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  19. A. Pfeiffer
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  20. A. Ray
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  21. J. Schukraft
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  22. D. Shapira
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  23. J. Soltani
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  24. H. J. Specht
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  25. I. Stumer
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  26. J. Thompson
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  27. R. J. Veenhof
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  28. W. J. Willis
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  29. C. Woody
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Antos, J., Beker, H., Brons, S. et al. Soft photon production in 450 GeV/cp-Be collisions. Z. Phys. C - Particles and Fields 59, 547–553 (1993). https://doi.org/10.1007/BF01562546

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  • DOI: https://doi.org/10.1007/BF01562546

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