The Crystal Ball detector at the e+e- storage ring DORIS II has been used to analyze exclusive semileptonic decays of B mesons produced at Y(4S) energies. The decay B -> e nu D* has been observed with a branching ratio of (7.0+-1.8+-1.4)% using the pi0 D decay mode of the D*. In addition we have searched for the exclusive semileptonic decay B+- -> e+- nu pi0. We find an upper limit on B+- -> e+- nu pi0 of 0.22% at the 90% CL.
Observation of the exclusive decay B -> e nu D * and search for B -> e nu pi0 / D., Antreasyan; H. W., Bartels; C., Bieler; J. K., Bienlein; Bizzeti, Andrea; E. D., Bloom; K., Brockmüller; A., Cartacci; M., Cavalli Sforza; R., Clare. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - STAMPA. - 48:(1990), pp. 553-559. [10.1007/BF01614688]
Observation of the exclusive decay B -> e nu D * and search for B -> e nu pi0
BIZZETI, Andrea;
1990
Abstract
The Crystal Ball detector at the e+e- storage ring DORIS II has been used to analyze exclusive semileptonic decays of B mesons produced at Y(4S) energies. The decay B -> e nu D* has been observed with a branching ratio of (7.0+-1.8+-1.4)% using the pi0 D decay mode of the D*. In addition we have searched for the exclusive semileptonic decay B+- -> e+- nu pi0. We find an upper limit on B+- -> e+- nu pi0 of 0.22% at the 90% CL.
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