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Radiative decay ofJ/ψ into γ π+ π−

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Zeitschrift für Physik C Particles and Fields

Abstract

The radiative decayJ/ψ → γ π+ π− has been studied using the 8.6 millionJ/ψ produced in the DM2 experiment at the DCIe +e− storage rings at Orsay. The π+ π− mass spectrum shows a cleanf 2 (1270) signal, and the possible presence of two other states at thef 2 (1720) andf 4 (2030) masses. For thef 2 (1270), the branching ratio BR(J/ψ →γf)xBR(f→π+ π−) is measured to be (7.50±0.30±1.12)×10−4, and the spin analysis prefers theJ=2 assignment, with helicity parametersx=0.83±0.06 andy=0.01±0.06. The existence of higher mass states is discussed.

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Authors and Affiliations

  1. Laboratoire de l'Accélérateur Linéaire, Université de Paris-Sud, F-91405, Orsay, France

    J. -E. Augustin, G. Cosme, F. Couchot, B. Dudelzak, F. Fulda, B. Grelaud, G. Grosdidier, B. Jean-Marie, S. Jullian, D. Lalanne, V. Lepeltier, B. Louis, F. Mané, C. Paulot, R. Riskalla, Ph. Roy, F. Rumpf & G. Szklarz

  2. Laboratoire de Physique Corpusculaire, Université de Clermont II, BP 45, F-63170, Aubière, France

    Z. Ajaltouni, A. Falvard, J. Jousset, B. Michel & J. C. Montret

  3. Laboratori Nazionali di Frascati dell'INFN, CP 13, I-00044, Frascati, Italy

    R. Baldini, S. Calcaterra & G. Capon

  4. Sezione di Padova, Dipartimento di Fisica dell'Università di Padova, e INFN, I-35131, Padua, Italy

    D. Bisello, G. Busetto, S. Limentani, M. Nigro, L. Pescara, M. Posocco, P. Sartori & L. Stanco

Authors
  1. J. -E. Augustin
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  2. G. Cosme
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  3. F. Couchot
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  4. B. Dudelzak
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  5. F. Fulda
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  6. B. Grelaud
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  7. G. Grosdidier
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  8. B. Jean-Marie
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  9. S. Jullian
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  10. D. Lalanne
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  11. V. Lepeltier
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  12. B. Louis
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  13. F. Mané
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  14. C. Paulot
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  15. R. Riskalla
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  16. Ph. Roy
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  17. F. Rumpf
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  18. G. Szklarz
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  19. Z. Ajaltouni
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  20. A. Falvard
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  21. J. Jousset
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  22. B. Michel
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  23. J. C. Montret
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  24. R. Baldini
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  25. S. Calcaterra
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  26. G. Capon
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  27. D. Bisello
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  28. G. Busetto
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  29. S. Limentani
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  30. M. Nigro
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  31. L. Pescara
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  32. M. Posocco
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  33. P. Sartori
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  34. L. Stanco
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DM2 Collaboration

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DM2 Collaboration., Augustin, J.E., Cosme, G. et al. Radiative decay ofJ/ψ into γ π+ π− . Z. Phys. C - Particles and Fields 36, 369–376 (1987). https://doi.org/10.1007/BF01573930

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  • DOI: https://doi.org/10.1007/BF01573930

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