Evidence for b baryons in Z decays

D. Decamp, B. Deschizeaux, C. Goy, J. P. Lees, M. N. Minard, R. Alemany, F. Ariztizabal, J. M. Crespo, M. Delfino, E. Fernandez, V. Gaitan, Ll Garrido, Ll M. Mir, A. Pacheco, A. Pascual, M. G. Catanesi, 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, F. Bird, E. Blucher, G. Bonvicini, F. Bossi, J. Boudreau, T. H. Burnett, H. Drevermann, R. W. Forty, C. Grab, R. Hagelberg, S. Haywood, J. Hilgart, E. Jost, M. Kasemann, J. Knobloch, A. Lacourt, E. Lançon, I. Lehraus, T. Lohse, A. Lusiani, M. Martinez, P. Mato, S. Menary, T. Meyer, A. Minten, A. Miotto, 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, W. Tejessy, H. Wachsmuth, W. Wiedenmann, W. Witzeling, J. Wotschack, Z. Ajaltouni, F. Badaud, M. Bardadin-Otwinowska, A. M. Bencheikh, R. El Fellous, A. Falvard, P. Gay

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32 Citations (Scopus)

Abstract

In 160 000 hadronic Z decays recorded with the ALEPH detector at LEP, the yields of Λℓ- and Λℓ+ combinations have been measured. The observed excess of Λℓ- over Λℓ+ of 53±13 is interpreted as evidence for b baryons and their semileptonic decay. Assuming that three body decay processes such as Λb→Λc+ℓ -v dominate the semileptonic decay of b baryons, this ex cess corresponds to a product branching ratio BR(b→Λb)·BR(Λb→ Λc+ℓ-v)·BR(Λ c +→ΛX) = (0.95±0.22 (stat.)±0.21(syst.))%, where Λb and Λc+ denote the bottom and charm baryons respectively. © 1992.
Original languageEnglish
Pages (from-to)209-216
JournalPhysics Letters B
Volume278
Issue number1-2
DOIs
Publication statusPublished - 19 Mar 1992

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