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 B --> D(s)(D) over bar(X) and B --> D (D) over bar(X) (where D can be either a D(0), a D(+) or a D*(+)), providing the first direct evidence for doubly-charmed B decays involving no D(s) production. Evidence for associated K-s(O) and K(+/-) production in the decays B --> D (D) over bar(X) is also presented and some candidates for completely reconstructed decays B --> D(s)(D) over bar(n pi), B --> D (D) over bar K-s(0) and B --> D (D) over bar K(+/-) are observed. Furthermore, candidates for the two-body Cabibbo suppressed decays B(O) --> D*(-)D*(+) and B(-) --> D(*)0 D(*)- are also observed. Measurements of the corresponding branching fractions are extracted.

R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1998). Observation of doubly-charmed B decays at LEP. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 4(3), 387-407 [10.1007/s100520050216].

Observation of doubly-charmed B decays at LEP

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1998-01-01

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 B --> D(s)(D) over bar(X) and B --> D (D) over bar(X) (where D can be either a D(0), a D(+) or a D*(+)), providing the first direct evidence for doubly-charmed B decays involving no D(s) production. Evidence for associated K-s(O) and K(+/-) production in the decays B --> D (D) over bar(X) is also presented and some candidates for completely reconstructed decays B --> D(s)(D) over bar(n pi), B --> D (D) over bar K-s(0) and B --> D (D) over bar K(+/-) are observed. Furthermore, candidates for the two-body Cabibbo suppressed decays B(O) --> D*(-)D*(+) and B(-) --> D(*)0 D(*)- are also observed. Measurements of the corresponding branching fractions are extracted.
1998
R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1998). Observation of doubly-charmed B decays at LEP. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 4(3), 387-407 [10.1007/s100520050216].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/37710
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