The electron spectrum from B meson decays

K. Wachs, D. Antreasyan, H. W. Bartels, Ch Bieler, J. K. Bienlein, A. Bizzeti, E. D. Bloom, K. Brockmüller, A. Cartacci, M. Cavalli-Sforza, R. Clare, A. Compagnucci, G. Conforto, S. Cooper, D. Coyne, G. Drews, K. Fairfield, G. Folger, A. Fridman, D. GelphmanG. Glaser, G. Godfrey, K. Graaf, F. H. Heimlich, F. H. Heinsius, R. Hofstadter, J. Irion, Z. Jakubowski, K. Karch, S. Keh, T. Kiel, H. Kilian, I. Kirkbride, M. Kobel, W. Koch, A. C. König, K. Königsmann, S. Krüger, G. Landi, S. Leffler, R. Lekebusch, A. M. Litke, S. Lowe, B. Lurz, H. Marsiske, W. Maschmann, P. McBride, H. Meyer, B. Muryn, W. J. Metzger, B. Monteleoni, B. Niczyporuk, G. Nowak, C. Peck, C. Pegel, P. G. Pelfer, F. C. Porter, M. Reidenbach, M. Scheer, P. Schmitt, J. Schotanus, J. Schütte, A. Schwarz, F. Selonke, D. Sievers, T. Skwarnicki, V. Stock, K. Strauch, U. Strohbusch, J. Tompkins, B. van Uitert, R. T. Van de Walle, A. Voigt, U. Volland, K. Wacker, W. Walk, H. Wegener, D. Williams

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36 Scopus citations


The Crystal Ball Collaboration has measured the energy spectrum of electrons from semileptonic B meson decays at the e+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→evXc)=(11.7±0.4±1.0)%. Our result for the corresponding Kobayashi-Maskawa matrix element is |Vcb|=0.052±0.006. The model dependence of both results is included in the error. We have not observed semileptonic B decays to non-charmed mesons. Analyzing the measured electron spectrum above 2.4 GeV, where no b→c decays contribute, we find BR(B→evXu)/BR(B→evXc)<6.5% at the 90% confidence level. This corresponds to an upper limit |Vub/Vcb|<0.21.

Original languageEnglish (US)
Pages (from-to)33-48
Number of pages16
JournalZeitschrift für Physik C Particles and Fields
Issue number1
StatePublished - Mar 1989
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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