Measurement of the decay B0→D−ℓ+ν

H. Albrecht, A.A. Andam, U. Binder, P. Böckmann, R. Gläser,G. Harder, A. Nippe, M. Schäfer, W. Schmidt-Parzefall, H. Schröder,Holger Schulz, R. Wurth, A. Yagil, J. P. Donker,A. Drescher,D. Kamp,Hermann Kolanoski, U. Matthiesen, H. Scheck, B. Spaan, J. Spengler, D. Wegener, J. C. Gabriel,T. Ruf, K. R. Schubert, J. Stiewe, K. Strahl, Roland Waldi,K. W. Edwards,Wr Frisken,D. J. Gilkinson,Doug Gingrich, H. Kapitza, P. C. H. Kim,Robert K. Kutschke,D. B. MacFarlane,J. A. McKenna,K. W. McLean, A. W. Nilsson,R. S. Orr,P. Padley,J. A. Parsons,P. M. Patel,J. D. Prentice, H. Seywerd,J. D. Swain,Georgios Tsipolitis, T. S. Yoon,J. C. Yun, R. Ammar, D. Coppage, R. Davis, S. Kanekal, N. Kwak, B. Boštjančič, G. Kernel, M. Pleško,Leif J. Jönsson,Anton Babaev,Mikhail Danilov, B. Fominykha, A. Golutvin, I. V. Gorelov,V. Lubimov, Viktor Matveev, V. Nagovitsin, V. Ryltsov,A. Semenov,V. Shevchenko, V. Soloshenko, V. Tchistilin, I. Tichomirov,Yu. Zaitsev, R. Childers,C. W. Darden,Y. Oku

Physics Letters B(1989)

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摘要
Abstract Using the ARGUS detector at the e + e − storage ring DORIS II, we have investigated the decay B 0 →D − l + ν, where l + is e + or μ + . The B 0 mesons were produced in 150 000 ϒ(4S) decays. Assuming electron-muon universality we obtain a branching ratio BR(B 0 →D − e + ν )=BR(B 0 →D − μ + ν )=(1.8±0.6±0.5)%.
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