Observation of the exclusive decayB→evD* and search forB→evπ0

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

Observation of the exclusive decayB→evD* and search forB→evπ0

1990

The Crystal Ball detector at thee+e− storage ring DORIS II has been used to analyze exclusive semileptonic decays ofB mesons produced at γ(4S) energies. The decayB→evD* has been observed with a branching ratio of (7.0±1.8±1.4)% using theπ°D decay mode of theD*. In addition we have searched for the exclusive semileptonic decayB±→e±vπ0. We find an upper limit onB±→e±vπ0 of 0.22% at the 90% CL.

Keywords:

Particle acceleration
Detector
Quantum field theory
Crystal Ball
Meson
Particle physics
Storage ring
Branching fraction
Elementary particle
Physics
Nuclear physics

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