A measurement of the product branching ratio $f ({\rm b} \to \Lambda_{\rm b}) \cdot{\rm BR} (\Lambda_{\rm b} \to \Lambda {\rm X})$ in ${\rm Z}^0$ decays

G. Abbiendi et al.,G. Abbiendi,K. Ackersta, G. Alexander,J. Allison,N. Altekamp,S. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, E. Barberio,S. Baumann,J. Bechtluft,T. Behnke, G. Bella, A. Bellerive,S. Bethke,S. Betts, O. Biebel,A. Biguzzi, V. Blobel, D. Bonacorsi, M. Boutemeur,S. Braibant,P. Bright-Thomas, L. Brigliadori, P. Capiluppi,D. Chrisman,C. Ciocca,E. Clay,I. Cohen,C. Couyoumtzelis,M. Cuani,S. Dado,C. Darling,R. Davis, P. Dervan,K. Desch,B. Dienes, J. Dubbert, E. Duchovni,D. Eatough, E. Etzion,F. Fabbri,M. Fanti,M. Fierro, I. Fleck,R. Folman,P. Gagnon,J. Gascon, G. Gaycken,C. Geich-Gimbel, G. Giacomelli,P. Giacomelli, V. Gibson,D. Glenzinski,J. Goldberg, W. Gorn,C. Grandi,K. Graham,E. Gross,M. Gruwe,M. Hansroul,M. Hapke, K. Harder, A. Harel,C. Hartmann,M. Hauschild,R. Hawkings,M. Herndon, G. Herten, A. Hocker,K. Homan

msra（1999）

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摘要

. The product branching ratio, , where denotes any weakly-decaying b–baryon, has been measured using the OPAL detector at LEP. 's are selected by the presence of energetic particles in bottom events tagged by the presence of displaced secondary vertices. A fit to the momenta of the particles separates signal from B meson and fragmentation backgrounds. The measured product branching ratio is Combined with a previous OPAL measurement, one obtains

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A measurement of the product branching ratio in decays

A measurement of the product branching ratio $f ({\rm b} \to \Lambda_{\rm b}) \cdot{\rm BR} (\Lambda_{\rm b} \to \Lambda {\rm X})$ in ${\rm Z}^0$ decays