A Model-Independent Determination Of The Inclusive Semileptonic Decay Fraction Of B-Mesons

H Albrecht,H Schroder, R Waldi,A Golutvin, A Snizhko,P Krizan,D Wegener,Yu I Zaitsev, Mark Bittner,H Wegener, Balagura,T Hamacher,M Schieber,T S Yoon,H Ehrlichmann,M Schmidtler,T Zivko,W Schmidtparzefall, S Chechelnitskii,H Schulz,C E K Charlesworth,R Wurth, Soloshenko,P R B Saull, S Semenov,W Funk,K Ehret,Reinhard Mundt,S Nowak,Yu Gershtein,J D Prentice, E R F Hyatt,Marlon R Schneider, H Kapitza,K Strahl,P Krieger,R Reiner,R Eckmann,I Belyaev,D Topfer,P M Patel,T Oest,K R Schubert,M Paulini,Maggie C Walter,F Ratnikov,K Reim,K W Edwards,J Spengler,K Tzamariudaki,A Kosche,D Ressing,W Hofmann, E Kriznic,H Thurn,M Danilov,I Korolko,G Kernel,D B Macfarlane,Shoab A Khan,D Britton,I Tichomirov, R Mankel,T Siegmund,P Pakhlov,P Eckstein,M Seeger,A Lindner, A E Lange,B Spaan, Lubimov,R Van De Water,H Kolanoski,S Weseler,A Droutskoy,S Werner,G Kostina,A Hupper,T Podobnik,J Stiewe,A Nau,T Kirchhoff,D O Litvintsev,K T Knopfle,C Hast,R P Hofmann

PHYSICS LETTERS B（1993）

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摘要

With the ARGUS detector at the e+e- storage ring DORIS II, we have determined decay fraction and electron momentum spectrum of the inclusive decay mode B --> e(upsilon) X. Using lepton tags from the second B meson in 209 000 UPSILON(4S) --> BBBAR decays, we could determine the spectrum for all electron momenta p(e) > 0.6 GeV/c. Including the small extrapolation to p(e) > 0, we find the model-independent decay fraction beta(B --> eupsilonX) = (9.6 +/- 0.5 +/- 0.4)%. Adding D meson tags, our result is (9.7 +/- 0.5 +/- 0.4)%.

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