Determination of |V<inf>ub</inf>| from the measurement of the inclusive charmless semileptonic branching ratio of b hadrons

R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte, E. Merle, M. N. Minard, J. Y. Nief, B. Pietrzyk, R. Alemany, G. Boix, M. P. Casado, M. Chmeissani, J. M. Crespo, M. Delfino, E. Fernandez, M. Fernandez-Bosman, L. GarridoE. Graugès, A. Juste, M. Martinez, G. Merino, R. Miquel, L. M. Mir, I. C. Park, A. Pascual, I. Riu, F. Sanchez, A. Colaleo, D. Creanza, M. dePalma, G. Gelao, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, U. Becker, P. Bright-Thomas, D. Casper, M. Cattaneo, V. Ciulli, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, R. Hagelberg, J. B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, P. Mato, A. Minten, L. Moneta, A. Pacheco, F. Ranjard, L. Rolandi, D. Rousseau, D. Schlatter, M. Schmitt, O. Schneider, W. Tejessy, F. Teubert, I. R. Tomalin, H. Wachsmuth, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, A. Falvard, C. Ferdi, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. C. Montret, D. Pallin

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Abstract

From a study of the kinematic properties of the final state produced in the semileptonic decays b → Xℓvℓ, the inclusive charmless semileptonic branching ratio of b hadrons is measured. With a sample of 3.6 million hadronic Z decays recorded between 1992 and 1995 with the ALEPH detector at LEP, the value Br(b → Xuℓvℓ) is determined to be (1.73 ± 0.55stat ± 0.55syst) × 10-3, where Xu represents any charmless hadronic state and b is a mixture of b hadrons weighted by their production rates. This measurement yields the result |Vub|2 = (18.68 ± 5.94stat ± 5.94syst ± 1.45HQE) × 10-6, where the last error comes from the conversion of the branching ratio to the CKM matrix element squared.
Original languageEnglish
Pages (from-to)555-574
JournalEuropean Physical Journal C
Volume6
Issue number4
Publication statusPublished - 1 Jan 1999

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