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Experimental upper limits for the hadronic transitions Υ(2S)→ηΥ(1S) and Υ(2S)→π0Υ(1S)

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Zeitschrift für Physik C Particles and Fields

Abstract

Using the Crystal Ball detector at thee +e− storage ring DORIS-II, we have searched for the hadronic transitions Υ(2S)→ηΥ(1S) and Υ(2S)→π0Υ(1S) in exclusive decays where the Υ(1S) decays into ane +e− or aµ + µ - pair and the η and π0 are detected by their decay modes η→γγ, η→γγ and π0→γγ. From the number of observed events we derive, after consideration of possible background sources, upper limits on the branching ratiosB(Υ(2S)→ηΥ(1S))<0.7% andB(Υ(2S)→π0Υ(1S))<0.8% at the 90% confidence level.

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Author notes

  1. M. Cavalli-Sforza & D. Coyne

    Present address: Inst. for Particle Physics, University of California, 95064, Santa Cruz, CA, USA

  2. S. Cooper

    Present address: Massachusetts Institute of Technology, 02139, Cambridge, MA, USA

  3. A. Fridman

    Present address: DPHPE, Centre d'Etudes Nucléaires de Saclay, F-91191, Gif sur Yvette, France

Authors and Affiliations

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

    C. Edwards, C. Peck, F. C. Porter & P. Ratoff

  2. 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

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

    Z. Jakubowski & G. Nowak

  4. Deutsches Elektronen Synchrotron DESY, D-2000, Hamburg, Germany

    J. K. Bienlein, T. Kloiber, W. Koch, T. Skwarnicki, H. J. Trost & P. Zschorsch

  5. Universität Erlangen-Nürnberg, D-8520, Erlangen, Germany

    B. Lurz, G. Folger, U. Volland & H. Wegener

  6. INFN and University of Firenze, I-50100, Firenze, Italy

    A. Cartacci, G. Conforto, B. Monteleoni & P. G. Pelfer

  7. Institut für Experimentalphysik, Universität Hamburg, I., D-2000, Hamburg, Germany

    F. H. Heimlich, R. Lekebusch, W. Maschmann, R. Nernst, A. Schwarz, D. Sievers & U. Strohbusch

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

    D. Antreasyan, J. Irion, K. Strauch & D. Williams

  9. University of Nijmegen and NIKHEF, 6525 ED, Nijmegen, The Netherlands

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

  10. Princeton University, 08544, Princeton, NJ, USA

    D. Besset, R. Cabenda, M. Cavalli-Sforza, R. Cowan & D. Coyne

  11. Department of Physics HEPL, and Stanford Linear Accelerator Center, Stanford University, 94305, Stanford, CA, USA

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

  12. Universität Würzburg, D-8700, Würzburg, Germany

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

Authors
  1. B. Lurz
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  2. D. Antreasyan
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  3. D. Besset
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  4. J. K. Bienlein
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  5. E. D. Bloom
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  6. I. Brock
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  7. R. Cabenda
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  8. A. Cartacci
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  9. M. Cavalli-Sforza
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  10. R. Clare
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  11. G. Conforto
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  12. S. Cooper
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  13. R. Cowan
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  14. D. Coyne
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  15. C. Edwards
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  16. A. Engler
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  17. G. Folger
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  18. A. Fridman
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  19. J. Gaiser
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  20. D. Gelphman
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  22. F. H. Heimlich
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  23. R. Hofstadter
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  24. J. Irion
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  25. Z. Jakubowski
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  26. S. Keh
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  27. H. Kilian
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  28. I. Kirkbride
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  29. T. Kloiber
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  30. W. Koch
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  31. A. C. König
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  34. R. Lee
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  36. R. Lekebusch
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  37. A. M. Litke
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  38. W. Lockman
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  39. S. Lowe
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  40. D. Marlow
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  41. W. Maschmann
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  42. T. Matsui
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  43. F. Messing
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  44. W. J. Metzger
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  45. B. Monteleoni
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  46. R. Nernst
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  47. B. Niczyporuk
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  48. G. Nowak
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  49. C. Peck
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  57. M. Scheer
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  70. K. Wacker
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  71. W. Walk
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  72. H. Wegener
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  73. D. Williams
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  74. P. Zschorsch
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Crystal Ball Collaboration., Lurz, B., Antreasyan, D. et al. Experimental upper limits for the hadronic transitions Υ(2S)→ηΥ(1S) and Υ(2S)→π0Υ(1S). Z. Phys. C - Particles and Fields 36, 383–388 (1987). https://doi.org/10.1007/BF01573932

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  • DOI: https://doi.org/10.1007/BF01573932

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