Observation of the semileptonic decays of B<inf>S</inf> and Λ<inf>b</inf> hadrons at LEP

D. Buskulic, D. Decamp, C. Goy, J. P. Lees, M. N. Minard, B. Mours, R. Alemany, F. Ariztizabal, P. Comas, J. M. Crespo, M. Delfino, E. Fernandez, V. Gaitan, Ll Garrido, A. Pacheco, A. Pascual, D. Creanza, M. de Palma, A. Farilla, G. IaselliG. Maggi, M. Maggi, S. Natali, S. Nuzzo, M. Quattromini, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, Y. Gao, H. Hu, D. Huang, X. Huang, J. Lin, J. Lou, C. Qiao, T. Wang, Y. Xie, D. Xu, R. Xu, J. Zhang, W. Zhao, W. B. Atwood, L. A.T. Bauerdick, E. Blucher, G. Bonvicini, F. Bossi, J. Boudreau, T. H. Burnett, H. Drevermann, R. W. Forty, R. Hagelberg, J. Harvey, S. Haywood, J. Hilgart, R. Jacobsen, B. Jost, J. Knobloch, E. Lançon, I. Lehraus, T. Lohse, A. Lusiani, M. Martinez, P. Mato, T. Mattison, H. Meinhard, S. Menary, T. Meyer, A. Minten, R. Miquel, H. G. Moser, J. Nash, P. Palazzi, J. A. Perlas, F. Ranjard, G. Redlinger, L. Rolandi, A. Roth, J. Rothberg, T. Ruan, M. Saich, D. Schlatter, M. Schmelling, F. Sefkow, W. Tejessy, H. Wachsmuth, W. Wiedenmann, T. Wildish, W. Witzeling, J. Wotschack, Z. Ajaltouni, F. Badaud, M. Bardadin-Otwinowska, A. M. Bencheikh, R. El Fellous, A. Falvard

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36 Citations (Scopus)


In 450 000 hadronic Z decays recorded with the ALEPH detector at LEP, the yields of Ds-ℓ+ and Λc+ℓ- combinations have been measured. 16.0 ± 4.3 Ds-ℓ+ combinations were observed in the Ds- → ππ- channel and 17.0 ± 4.5 combinations were observed in the Ds- → K*0K- channel. 21.0 ± 5.0 Λc+ℓ- combinations were observed, with the Λc+ reconstructed in the decay mode Λc+ → pK-π+. These events provide evidence for the decays Bs → Ds-Xℓ+ν and Λb → Λc+Xℓ-ν. Assuming that the Bs and Λb semileptonic decays are dominantly three-body, these observed yields, after background subtraction, translate into the following product branching ratios: Br(b → Bs)Br(Bs → Ds-Xℓ+ν) = 0.040±0.011 -0.012+0.010, Br(b → Λb)Br(Λb → Λc+Xℓ-ν) = 0.030±0.007±0.009. © 1992.
Original languageEnglish
Pages (from-to)145-156
JournalPhysics Letters B
Publication statusPublished - 5 Nov 1992


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