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The electron spectrum fromB meson decays

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Zeitschrift für Physik C Particles and Fields

Abstract

The Crystal Ball Collaboration has measured the energy spectrum of electrons from semileptonicB meson decays at thee + e − storage ring DORIS II. Branching ratios and weak mixing angles of the Kobayashi-Maskawa matrix are determined using several models for the hadronic matrix elements. We obtain the branching ratio for semileptonic.B decays to charmed states BR(B→evX c )=(11.7±0.4±1.0)%. Our result for the corresponding Kobayashi-Maskawa matrix element is |V cb |=0.052±0.006. The model dependence of both results is included in the error. We have not observed semileptonicB decays to non-charmed mesons. Analyzing the measured electron spectrum above 2.4 GeV, where nob→c decays contribute, we find BR(B→evX u )/BR(B→evX c )<6.5% at the 90% confidence level. This corresponds to an upper limit |V ub /V cb |<0.21.

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Author notes

  1. S. Cooper

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

  2. A. Fridman

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

  3. K. Königsmann

    Present address: Sektion Physik, Universität München, D-8000, München, FRG

  4. B. Muryn

    Present address: Institute of Physics and Nuclear Techniques, AGH, PL-30055, Cracow, Poland

Authors and Affiliations

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

    C. Peck & F. C. Porter

  2. University of California at Santa Cruz, 95064, Santa Cruz, CA, USA

    M. Cavalli-Sforza & D. Coyne

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

    Z. Jakubowski, B. Muryn & G. Nowak

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

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

  5. Universität Erlangen-Nürnberg, D-8520, Erlangen, 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. Universität Hamburg, I. Institut für Experimentalphysik, D-2000, Hamburg, Germany

    Ch. Bieler, K. Graaf, F. H. Heimlich, F. H. Heinsius, T. Kiel, S. Krüger, R. Lekebusch, W. Maschmann, 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

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

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

    E. D. Bloom, R. Clare, S. Cooper, K. Fairfield, D. Gelphman, G. Godfrey, R. Hofstadter, I. Kirkbride, S. Leffler, A. M. Litke, S. Lowe, B. Niczyporuk, A. Schwarz, J. Tompkins, B. van Uitert & K. Wacker

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

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

Authors
  1. K. Wachs
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  2. D. Antreasyan
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  4. Ch. Bieler
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  5. J. K. Bienlein
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  6. A. Bizzeti
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  7. E. D. Bloom
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  8. K. Brockmüller
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  10. M. Cavalli-Sforza
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  11. R. Clare
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  12. A. Compagnucci
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  13. G. Conforto
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  14. S. Cooper
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  15. D. Coyne
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  16. G. Drews
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  17. K. Fairfield
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  18. G. Folger
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  28. Z. Jakubowski
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  31. T. Kiel
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  33. I. Kirkbride
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  34. M. Kobel
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  36. A. C. König
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  39. G. Landi
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  77. H. Wegener
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  78. D. Williams
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Consortia

Crystal Ball Collaboration

Additional information

Supported by the U.S. Department of Energy, contract No. DE-AC03-81ER40050 and by the National Science Foundation, grant No. PHY75-22980

Supported by the U.S. Department of Energy, contract No. DE-AC02-76ER03072 and by the National Science Foundation, grant No. PHY82-08761

Supported by the German Bundesministerium für Forschung und Technologie, contract No. 054ER11P(5)

Supported by the German Bundesministerium für Forschung und Technologie, contract No. 054HH11P(7) and by the Deutsche Forschungsgemeinschaft

Supported by the U.S. Department of Energy, contract No. DE-AC02-76ER03064

Supported by FOM-ZWO

Supported by the U.S. Department of Energy, contract No. DE-AC03-76SF00326 and by the National Science Foundation, grant No. PHY81-07396

Supported by the U.S. Department of Energy, contract No. DE-AC03-76SF00515

Supported by the German Bundesministerium für Forschung und Technologie, contract No. 054WU11P(1)

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Crystal Ball Collaboration., Wachs, K., Antreasyan, D. et al. The electron spectrum fromB meson decays. Z. Phys. C - Particles and Fields 42, 33–48 (1989). https://doi.org/10.1007/BF01565126

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  • DOI: https://doi.org/10.1007/BF01565126

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