Observation of doubly-charmed B decays at LEP |
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Authors: | R Barate |
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Institution: | (1) Laboratoire de Physique des Particules (LAPP), IN2P3-CNRS, F-74019 Annecy-le-Vieux Cedex, France , FR |
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Abstract: | A search for doubly-charmed B decays with both charmed mesons reconstructed is performed, using about 3.8 million hadronic
Z decays recorded with the ALEPH detector at LEP. A clear signal is observed in the channels and (where D can be either a D, a D or a D), providing the first direct evidence for doubly-charmed B decays involving no production. Evidence for associated and production in the decays is also presented and some candidates for completely reconstructed decays , and are observed. Furthermore, candidates for the two-body Cabibbo suppressed decays and are also observed. Measurements of the corresponding branching fractions are extracted.
Received: 6 March 1998 / Published online: 23 June 1998 |
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Keywords: | |
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