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Measurement ofR ine + e − annihilation for\(\sqrt s \) between 7.4 and 9.4 GeV

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Zeitschrift für Physik C Particles and Fields

Abstract

The rationR=σ(e + e −→hadrons)/σ(e + e −→ µ+ µ−) was measured with the LENA detector at DORIS in a scan between 7.40 and 7.48 GeV and between 8.67 and 9.43 GeV center of mass energies. Corrected for QED radiative effects,R is found to be constant with an average value ofR=3.37 ±0.06stat±0.23syst. No narrow resonances withΓ ee (Γ had/Γ tot)⊗0.30 keV (95% C.L.) and no steps have been observed. Based on this value ofR, revised values for υ(1S) resonance parameters are presented.

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Authors and Affiliations

  1. Institute of Nuclear Physics, Cracow, Poland

    B. Niczyporuk, Z. Jakubowski & G. Nowak

  2. Physikalisches Institut der Universität Erlangen-Nürnberg, D-8520, Erlangen, Federal Republic of Germany

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

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

    J. K. Bienlein, R. Graumann, H. -J. Trost & M. Schmitz

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

    F. H. Heimlich, R. Nernst, A. Schwarz, U. Strohbusch & P. Zschorsch

  5. Nijmegen, University of Nijmegen and NIKHEF, The Netherland

    K. W. Chen, A. C. König & D. J. Schotanus

  6. Department of Physics, Carnegie-Mellon University, Pittsburgh, PA, USA

    M. Coles, A. Engler, R. W. Kraemer, D. Marlow, F. Messing, C. Rippich & S. Youssef

  7. DPhPE, Centre d'Etudes Nucléaires de Saclay, F-91190, Gif sur Yvette, France

    A. Fridman

  8. Department of Physics and Astronomy, Tel-Aviv University, Israel

    G. Alexander, A. Av-Shalom, G. Bella & J. Grunhaus

  9. Physikalisches Institut der Universität Würzburg, D-8700, Würzburg, Federal Republic of Germany

    M. Scheer

Authors
  1. B. Niczyporuk
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  2. Z. Jakubowski
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  3. G. Nowak
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  4. G. Folger
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  5. B. Lurz
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  6. U. Volland
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  7. H. Wegener
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  8. J. K. Bienlein
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  9. R. Graumann
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  10. H. -J. Trost
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  11. M. Schmitz
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  12. F. H. Heimlich
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  13. R. Nernst
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  14. A. Schwarz
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  15. U. Strohbusch
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  16. P. Zschorsch
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  17. K. W. Chen
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  18. A. C. König
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  19. D. J. Schotanus
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  20. M. Coles
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  21. A. Engler
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  22. R. W. Kraemer
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  23. D. Marlow
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  24. F. Messing
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  25. C. Rippich
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  26. S. Youssef
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  27. A. Fridman
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  28. G. Alexander
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  29. A. Av-Shalom
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  30. G. Bella
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  31. J. Grunhaus
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  32. M. Scheer
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Consortia

LENA Collaboration

Additional information

Partially supported by FOM-ZWO

Partially supported by the US Department of Energy

Partially supported by the Israeli Academy of Sciences and Humanities — Basic Research Foundation

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LENA Collaboration., Niczyporuk, B., Jakubowski, Z. et al. Measurement ofR ine + e − annihilation for\(\sqrt s \) between 7.4 and 9.4 GeV. Z. Phys. C - Particles and Fields 15, 299–309 (1982). https://doi.org/10.1007/BF01614421

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  • DOI: https://doi.org/10.1007/BF01614421

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