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Determination ofГ ee of the Υ(1S) and Υ(2S) resonances, and measurement ofR atW=9.39 GeV

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Zeitschrift für Physik C Particles and Fields

Abstract

Using the Crystal Ball detector operating at the DORIS II storage ring we have measured the leptonic partial widthsГ ee of the Υ(1S) and Υ(2S) resonances. We find

$$\Gamma _{ee} (\Upsilon (1S)) = 1.34 \pm 0.03 \pm 0.06keV$$

and

$$\Gamma _{ee} (\Upsilon (2S)) = 0.56 \pm 0.04 \pm 0.02keV.$$

The effect onГ ee of applying different prescriptions for radiative corrections is discussed. We also measureR, the ratio of non-resonant hadronic cross section to the Born cross section of μ pair production, at c.m. energyW=9.39 GeV to beR=3.48±0.04±0.16.

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Author information

Author notes

  1. M. Cavalli-Sforza & D. Coyne

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

  2. A. Fridman

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

Authors and Affiliations

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

    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, B. Muryn & G. Nowak

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

    H. W. Bartels, J. K. Bienlein, K. Brockmüller, G. Drews, T. Kloiber, W. Koch, H. Marsiske, H. Meyer, F. Selonke, T. Skwarnicki, H. J. Trost, A. Voigt, K. Wachs & P. Zschorsch

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

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

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

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

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

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

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

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

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

    H. Janssen, A. C. König, W. J. Metzger, C. Pols, M. Reidenbach, 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, K. Fairfield, A. Fridman, J. Gaiser, D. Gelphman, G. Godfrey, R. Hofstadter, I. Kirkbride, R. Lee, S. Leffler, A. M. Litke, W. Lockmann, S. Lowe, B. Niczyporuk, B. Pollock, A. Schwarz, J. Tompkins, B. van Uitert & K. Wacker

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

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

Authors
  1. Z. Jakubowski
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  2. D. Antreasyan
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  13. M. Cavalli-Sforza
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Massachusetts Institute of Technology, Cambridge, MA 02139, USA

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Crystal Ball Collaboration., Jakubowski, Z., Antreasyan, D. et al. Determination ofГ ee of the Υ(1S) and Υ(2S) resonances, and measurement ofR atW=9.39 GeV. Z. Phys. C - Particles and Fields 40, 49–61 (1988). https://doi.org/10.1007/BF01559717

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