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a 2(1320) andπ 2(1670) formation in the reactionγγ→π + π − π 0

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Zeitschrift für Physik C Particles and Fields

Abstract

The reactione + e −→e + e −π+π−π0 in the untagged mode has been measured with the CELLO detector at PETRA. The cross section is dominated by exclusivea 2(1320) production, whose radiative width is determined to beΓ γγ=1.00±0.07(stat.)±0.15(syst.)keV. An angular correlation analysis indicates pure helicity 2 with an upper limit on the helicity 0 contribution of 8.2% (at 95% c.l.). Excitation of the pseudotensor meson π 02 (1670) is observed for the first time in this reaction. The π2 radiative width and its dependence on interference effects are studied.

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Author information

Author notes

  1. H. Küster

    Present address: Deutsches Elektronen-Synchrotron, DESY, Hamburg, Federal Republic of Germany

  2. J. H. Field

    Present address: Université de Genève, Switzerland

  3. H. Jung & G. Flügge

    Present address: RWTH, Aachen, Germany

  4. J. Fuster

    Present address: Inst. de Física Corpuscular, Universidad de Valencia, Spain

  5. K. Gamerdinger

    Present address: MPI für Physik und Astrophysik, München, FRG

  6. P. Grosse-Wiesmann & G. Grindhammer

    Present address: Stanford Linear Accelerator Center, USA

Authors and Affiliations

  1. Deutsches Elektronen-Synchrotron, DESY, Hamburg, Federal Republic of Germany

    H. -J. Behrend, L. Criegee, J. H. Field, G. Franke, H. Jung, J. Meyer, O. Podobrin, V. Schröder & G. G. Winter

  2. University of Glasgow, Glasgow, UK

    P. J. Bussey, A. J. Campbell, D. Hendry, S. Lumsdon & I. O. Skillicorn

  3. II. Institut für Experimentalphysik, Universität, Hamburg, Federal Republic of Germany

    J. Ahme, V. Blobel, W. Brehm, M. Feind, H. Fenner, J. Harjes, J. H. Köhne, J. H. Peters & H. Spitzer

  4. Kernforschungszentrum Karlsruhe und Universität, Karlsruhe, Federal Republic of Germany

    W. -D. Apel, J. Engler, G. Flügge, D. C. Fries, J. Fuster, P. Gabriel, K. Gamerdinger, P. Grosse-Wiesmann, M. Hahn, U. Hädinger, J. Hansmeyer, H. Küster, H. Müller, K. H. Ranitzsch, H. Schneider & R. Seufert

  5. Max Planck-Institut für Physik und Astrophysik, München, Federal Republic of Germany

    W. de Boer, G. Buschhorn, G. Grindhammer, B. Gunderson, Ch. Kiesling, R. Kotthaus, H. Kroha, D. Lüers, H. Oberlack, P. Schacht, S. Scholz & W. Wiedenmann

  6. Laboratoire de l'Accélérateur Linéaire, Orsay, France

    M. Davier, J. F. Grivaz, J. Haissinski, V. Journé, D. W. Kim, F. Le Diberder & J. -J. Veillet

  7. Laboratoire de Physique Nucléaire et des Hautes Energies, Université de Paris, Paris, France

    K. Blohm, R. George, M. Goldberg, O. Hamon, F. Kapusta, L. Poggioli & M. Rivoal

  8. University of Rome and INFN, Rome, Italy

    G. d'Agostini, F. Ferrarotto, M. Iacovacci, G. Shooshtari & B. Stella

  9. Centre d'Etudes Nucléaires, Saclay, France

    G. Cozzika & Y. Ducros

  10. Tel Aviv University, Tel Aviv, Israel

    G. Alexander, A. Beck, G. Bella, J. Grunhaus, A. Klatchko, A. Levy & C. Milsténe

Authors
  1. H. -J. Behrend
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  2. L. Criegee
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  3. J. H. Field
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  4. G. Franke
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  5. H. Jung
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  6. J. Meyer
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  7. O. Podobrin
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  8. V. Schröder
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  9. G. G. Winter
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  10. P. J. Bussey
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  11. A. J. Campbell
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  12. D. Hendry
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  13. S. Lumsdon
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  14. I. O. Skillicorn
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  15. J. Ahme
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  16. V. Blobel
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  17. W. Brehm
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  18. M. Feind
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  19. H. Fenner
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  20. J. Harjes
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  21. J. H. Köhne
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  22. J. H. Peters
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  23. H. Spitzer
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  24. W. -D. Apel
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  25. J. Engler
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  26. G. Flügge
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  28. J. Fuster
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  29. P. Gabriel
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  31. P. Grosse-Wiesmann
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  32. M. Hahn
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  33. U. Hädinger
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  34. J. Hansmeyer
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  35. H. Küster
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  36. H. Müller
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  37. K. H. Ranitzsch
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  38. H. Schneider
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  42. G. Grindhammer
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  55. V. Journé
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  71. G. Cozzika
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  73. G. Alexander
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  77. A. Klatchko
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  78. A. Levy
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  79. C. Milsténe
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CELLO Collaboration

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Heisenberg Scholarship of Deutsche Forschungsgemeinschaft

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CELLO Collaboration., Behrend, H.J., Criegee, L. et al. a 2(1320) andπ 2(1670) formation in the reactionγγ→π + π − π 0 . Z. Phys. C - Particles and Fields 46, 583–591 (1990). https://doi.org/10.1007/BF01560259

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  • DOI: https://doi.org/10.1007/BF01560259

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