Determination of $\mid V_{ub} \mid$ from the Measurement of the Inclusive Charmless Semileptonic Branching Ratio of b hadrons

Determination of $\mid V_{ub} \mid$ from the Measurement of the Inclusive Charmless Semileptonic Branching Ratio of b hadrons

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,...

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Veröffentlicht in:The European physical journal. C, Particles and fields Particles and fields, 1999, Vol.6, p.555-574
Hauptverfasser: 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
Format: Artikel
Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung: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.
ISSN:1434-6044
1434-6052