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Barate, R.; Buskulic, D.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J P.; Lucotte, A.; Martin, F.; 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, L.; Graughs, E.; Juste, A.; Martmnez, M.; Merino, G.; Mir, L M.; Park, I C.; Pascual, A.; Riu, I.; Sanchez, F.; Creanza, D.; de Palma, M.; Gelao, G.; Iaselli, G.; Maggi, G.; Maggi, M.; Nuzzo, S.; Ranieri, A.; Raso, G.; Ruggieri, F.; Selvaggi, G.; Silvestris, L.; Tempesta, P.; Tricomi, A.; Zito, G.; Huang, X.; Ouyang, Q.; Wang, T.; Xie, Y.; Xu, R.; Xue, S.; Zhang, J.; Zhang, L.; Zhao, W.; Abbaneo, D.; Becker, U.; Bright-Thomas, P.; Casper, D.; Cattaneo, M.; Ciulli, V.; Dissertori, G.; Drevermann, H.; Forty, R W.; Frank, M.; Hagelberg, R.; Hansen, J B.; Harvey, J.; Janot, P.; Jost, B.; Lehraus, I.; Mato, P.; Minten, A.; Moneta, L.; Pacheco, A.; Rolandi, L.; Rousseau, D.; Schlatter, D.; Schmitt, M.; Schneider, O.; Tejessy, W.; Teubert, F.; Tomalin, I R.; Wachsmuth, H.; Ajaltouni, Ziad Zj; Badaud, F.; Chazelle, G.; Deschamps, O.; Falvard, Alain; Ferdi, C.; Gay, Pascal; Guicheney, C.; Henrard, Pierre; Jousset, J.; Michel, B.; Monteil, S.; Montret, Jean-Claude; Pallin, D.; Perret, Pascal; Podlyski, F.; Proriol, Joseph
The European physical journal. C, Particles and fields, 1999, Letnik: 6Journal Article
From a study of the kinematic properties of the final state produced in the semileptonic decays b-->X l nu, the inclusive charmless semileptonic branching ratio of b hadrons is measured. With a sam ple of 3.6 million hadronic Z decays recorded between 1992 and 1995 with the ALEPH detector at LEP, the value Br(b-->X_u l nu) is determined to be (1.73 +- 0.55_stat +- 0.55_syst)*10^{-3}, where X_u represents any charmless hadronic state and b is a mixture of b hadrons weighted by their production rates. This measurement yields the result |V_ub|^2= (18.68 +- 5.94_stat +- 5.94_syst +- 1 .45_HQE)*10^{-6}, where the last error comes from the conversion of the branching ratio to the CKM matrix element squared.
