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(O), 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)(O) 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((*)O)D((*)-) are also observed. Measurements of the corresponding branching fractions are extracted.

Observation of doubly-charmed B decays at LEP / Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Lucotte, A., Merle, E., Minard, M.n., Nief, J.y., Pietrzyk, B., Alemany, R., Boix, G., Casado, M.p., Chmeissani, M., Crespo, J.m., Delfino, M., Fernandez, E., Fernandez Bosman, M., Garrido, I., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 4:3(1998), pp. 387-407. [10.1007/s100529800924]

Observation of doubly-charmed B decays at LEP

CREANZA, Donato Maria;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
1998

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(O), 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)(O) 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((*)O)D((*)-) are also observed. Measurements of the corresponding branching fractions are extracted.
1998
Observation of doubly-charmed B decays at LEP / Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Lucotte, A., Merle, E., Minard, M.n., Nief, J.y., Pietrzyk, B., Alemany, R., Boix, G., Casado, M.p., Chmeissani, M., Crespo, J.m., Delfino, M., Fernandez, E., Fernandez Bosman, M., Garrido, I., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 4:3(1998), pp. 387-407. [10.1007/s100529800924]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/7642
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