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First observation of the reactionγγ→π 2→π 0 π 0 π 0

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Zeitschrift für Physik C Particles and Fields

Abstract

The Crystal Ball detector has been used at the DORIS II storage ring at DESY to study the reactionγγ→π 0 π 0 π 0 in theπ 0 π 0 π 0 invariant mass range from 850 MeV/c2 to 2600 MeV/c2. An enhancement around 1750 MeV/c2 is attributed to theπ 2(1670) resonance. The observedπ 0 π 0 invariant mass distribution and theπ 0 angular distributions are consistent with those expected for the decay chainπ 2→π 0 f 2(1270)→π 0 π 0 π 0. From our measurements we find the following resonance parameters: two photon partial width\(\Gamma _{\pi _2 }^{\gamma \gamma } = (1.41 \pm 0.23 \pm 0.28)keV\), massM(π 2)=(1742±31±49)MeV/c2. and total width\(\Gamma _{\pi _2 }^{tot} = (236 \pm 49 \pm 36)MeV\).

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Author information

Authors and Affiliations

  1. California Institute of Technologie, 91125, Pasadena, CA, USA

    C. Peck, F. C. Porter & P. Ratoff

  2. University of California at Santa Cruz, 95064, Santa Cruz, CA, USA

    M. Cavalli-Sforza, D. Coyne & D. A. Williams

  3. Carnegie-Mellon University, 15213, Pittsburgh, PA, USA

    I. Brock, A. Engler, R. W. Kraemer, D. Marlow, F. Messing, D. Prindle, B. Renger, C. Rippich & H. Vogel

  4. Cracow Institute of Nuclear Physics, PL-30055, Cracow, Poland

    B. Muryn & G. Nowak

  5. Deutsches Elektronen Synchrotron DESY, D-2000, Hamburg, Federal Republic of Germany

    H. W. Bartels, J. K. Bienlein, K. Brockmüller, Z. Jakubowski, K. Karch, T. Kloiber, W. Koch, H. Marsiske, W. Maschmann, H. Meyer, T. Skwarnicki, H. J. Trost, A. Voigt, K. Wachs & P. Zschorsch

  6. Universität Erlangen-Nürnberg, D-8520, Erlangen, Federal Republic of Germany

    G. Folger, G. Glaser, M. Kobel, B. Lurz, J. Schütte, U. Volland & H. Wegener

  7. INFN and University of Firenze, I-50125, Firenze, Italy

    A. Bizzeti, A. Cartacci, A. Compagnucci, G. Conforto, F. H. Heimlich, G. Landi, B. Monteleoni & P. G. Pelfer

  8. I. Institut für Experimentalphysik, Universität Hamburg, D-2000, Hamburg, Federal Republic of Germany

    Ch. Bieler, K. Graaf, F. H. Heinsius, T. Kiel, S. Krüger, R. Lekebusch, R. Nernst, D. Sievers, V. Stock & U. Strohbusch

  9. Harvard University, 02138, Cambridge, MA, USA

    D. Antreasyan, J. Irion, P. McBride, K. Strauch & D. A. Williams

  10. University of Nijmegen and NIKHEF, NL-6525 ED, Nijmegen, The Netherlands

    H. Janssen, A. C. König, W. J. Metzger, M. Reidenbach, J. Schotanus, R. T. Van de Walle & W. Walk

  11. Princeton University, 08544, Princeton, NJ, USA

    D. Besset, R. Cabenda & R. Cowan

  12. Department of Physics, HEPL, and Stanford Linear Accelerator Center, Stanford University, 94 94309, Stanford, CA, USA

    E. D. Bloom, R. Clare, S. Cooper, K. Fairfield, A. Fridman, J. Gaiser, D. Gelphman, G. Godfrey, R. Hofstadter, I. Kirkbride, R. Lee, S. Leffler, A. M. Litke, W. Lockman, S. Lowe, H. Marsiske, B. Niczyporuk, B. Pollock, A. Schwarz, J. Tompkins, B. van Uitert & K. Wacker

  13. Universität Würzburg, D-8700, Würzburg, Federal Republic of Germany

    S. Keh, H. Kilian, K. Königsmann, M. Scheer & P. Schmitt

  14. Max-Planck-Institut für Physik, D-8000, München 40, FRG

    S. Cooper

  15. DPHPE, Centre d'Etudes Nucléaires de Saclay, F-91191, Gif sur Yvette, France

    A. Fridman

  16. CERN, CH-1211, Genève 23, Switzerland

    K. Königsmann

  17. Institute of Physics and Nuclear Techniques, AGH, PL-30055, Cracow, Poland

    B. Muryn

Authors
  1. D. Antreasyan
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  2. H. W. Bartels
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  3. D. Besset
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  4. Ch. Bieler
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  5. J. K. Bienlein
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  6. A. Bizzeti
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  7. E. D. Bloom
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  8. I. Brock
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  9. K. Brockmüller
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  10. R. Cabenda
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  11. A. Cartacci
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  12. M. Cavalli-Sforza
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  13. R. Clare
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  14. A. Compagnucci
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  15. G. Conforto
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  16. S. Cooper
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  17. R. Cowan
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  18. D. Coyne
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  19. A. Engler
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  20. K. Fairfield
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  21. G. Folger
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  22. A. Fridman
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  23. J. Gaiser
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  24. D. Gelphman
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  25. G. Glaser
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  26. G. Godfrey
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  27. K. Graaf
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  28. F. H. Heimlich
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  29. F. H. Heinsius
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  30. R. Hofstadter
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  31. J. Irion
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  32. Z. Jakubowski
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  33. H. Janssen
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  34. K. Karch
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  35. S. Keh
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  36. T. Kiel
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  37. H. Kilian
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  38. I. Kirkbride
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  39. T. Kloiber
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  40. M. Kobel
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  41. W. Koch
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  42. A. C. König
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  95. H. Wegener
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  96. D. A. Williams
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  97. P. Zschorsch
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Crystal Ball Collaboration

Additional information

Supported by the U.S. Department of Energy, contract No. DE-AC03-81ER40050 and by the National Science Foundation, grant No. PHY75-22980

Supported by the National Science Foundation, grant No.-PHY85-12145

Supported by the U.S. Department of Energy, contract No. DE-AC02-76ER03066

Supported by the German Bundesministerium für Forschung und Technologie, contract No. 054 ER 11P(5)

Supported by the German Bundesministerium für Forschung und Technologie, contract No. 054 HH 11P(7) and by the Deutsche Forschungsgemeinschaft

Supported by the U.S. Department of Energy, contract No. DE-AC02-76ER03064

Supported by FOM-NWO

Supported by the U.S. Department of Energy, contract No. DE-AC02-76ER03072 and by the National Science Foundation, grant No. PHY82-08761

Supported by the U.S. Department of Energy, contract No. DE-AC03-76SF00326 and by the National Science Foundation, grant No. PHY81-07396

Supported by the U.S. Department of Energy, contract No. DE-AC03-76SF00515

Supported by the German Bundesministerium für Forschung und Technologie, contract No. 054 WU 11P(1)

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Crystal Ball Collaboration., Antreasyan, D., Bartels, H.W. et al. First observation of the reactionγγ→π 2→π 0 π 0 π 0 . Z. Phys. C - Particles and Fields 48, 561–568 (1990). https://doi.org/10.1007/BF01614689

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  • DOI: https://doi.org/10.1007/BF01614689

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