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Observation of B0-B0 mixing
Authors
H. Albrecht,A.A. Andam
U. Binder,P. Böckmann,R. Gläser,G. Harder,A. Nippe,M. Schäfer,W. Schmidt‐Parzefall,H. Schröder,H.D. Schulz,R. Wurth,A. Yagil,J.P. Donker,A. Drescher,D. Kamp,H. Kolanoski,U. Matthiesen,H. Scheck,B. Spaan,J. Spengler,D. Wegener,Christian Ehmann,John Gabriel,T. Ruf,R. Barlow,J. Stiewe,K. Strahl,T. Adye,S. Weseler,D. Jaffe,W.R. Frisken,D.J. Gilkinson,D. Gingrich,H. Kapitza,P.C.H. Kim,R. Kutschke,D. MacFarlane,J. McKenna,K. McLean,A.W. Nilsson,A. Onofre,P. Padley,J. Parsons,P. Patel,J.D. Prentice,H. Seywerd,J.D. Swain,C. Foudas,T.-S. Yoon,J. Yun,R. Ammar,D. Coppage,R. Davis,S. Kanekal,N. Kwak,J. Królikowski,G. Kernel,M. Pleško,J. Butterworth,A. Babaev,M. Danilov,B. Fominykh,A. Gorišek,I. Gorelov,V. Lubimov,V. Matveev,V. Nagovitsin,V. Ryltsov,A. Semenov,V. Shevchenko,V. Soloshenko,V. Tchistilin,I. Tichomirov,Yu. Zaitsev,R. Childers,C.W. Darden,Y. Oku,H. Gennow,M. Sani,E. Gabathuler,Douglas Gingrich,John Parsons,Andrei Sobol
+82 authors
,Viktor MatveevJournal
Published
Jun 1, 1987
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Abstract
Using the ARGUS detector at the DORIS II storage ring we have searched in three different ways for B0-B0 mixing in ϒ (4S) decays. One explicitly mixed event, a decay ϒ (4S)→B0B0, has been completely reconstructed. Furthermore, we observe a 4.0 standard deviation signal of 24.8 events with like-sign lepton pairs and a 3.0 standard deviation signal of 4.1 events containing one reconstructed B0(B0) and an additional fast ℓ+(ℓ)−. This leads to the conclusion that B0-B0 mixing is substantial. For the mixing parameter we obtain r=0.21±0.08.
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