Measurement of the Z 0 branching fraction to b quark pairs using the boosted sphericity product

Measurement of the Z 0 branching fraction to b quark pairs using the boosted sphericity product

From a sample of about 120 000 hadronic Z 0 decays, using a technique based on a separation of the different event categories in the boosted sphericity product, the fraction of b b decays has been measured to be 0.219 ± 0.014 (stat)± 0.019 (syst). Using the DELPHI determination of the hadronic Z 0 w...

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Veröffentlicht in:Physics letters. B 1992, Vol.281 (3), p.383-393
Hauptverfasser: Adye, T., Alvsvaag, S.J., Baroncelli, A., Baubillier, M., Berggren, M., Bertrand, D., Bonesini, M., Booth, P.S.L., Bosio, C., Brand, K.D., Bugge, L., Burmeister, H., Caccia, M., Calvi, M., Canale, V., Cattai, A., Chelkov, G.A., Chorowicz, V., Contreras, J.L., Contri, R., Couchot, F., Cuevas Maestro, J., Dagoret, S., Dalmagne, B., Daubie, E., De Boeck, H., De Lotto, B., Dris, M., Eek, L.-O., Engel, J.-P., Garcia, J., Gazis, E.N., Giacomelli, P., Gokieli, R., Graziani, E., Hamacher, K., Hao, W., Harris, F.J., Hietanen, I., Hultqvist, K., Isenhower, D., Johnson, D., Khomenko, B.A., Klovning, A., Korytov, A.V., Kostioukhine, V., Kronkvist, I., Lamsa, J.W., Leder, G., Lepeltier, V., Letessier-Selvon, A., Lindgren, J., Los, M., Lutz, P., Lyons, L., Mandl, F., Marco, J., Marin, J.-C., Matthiae, G., Michelotto, M., Mjoernmark, U., Myatt, G., Naraghi, F., Pingot, O., Polok, G., Pullia, A., Radojicic, D., Roditi, I., Rosso, E., Salt, J., Sanchez, E., Schyns, M.A.E., Simonetto, F., Skjevling, G., Sosnowski, R., Szymanski, P., Tchikilev, O., Theodosiou, G.E., Todorov, T., Toet, D.Z., Torassa, E., Trainor, M.T., Tsirou, A., Turluer, M.-L., Tuuva, T., Tyapkin, I.A., Tyndel, M., Ueberschaer, S., Vander Velde, C., Vegni, G., Venus, W., Vollmer, M., Weierstall, M., Wikne, J., Wilkinson, G.R., Williams, W.S.C., Yepes, P., Zevgolatakos, E., Zhang, G., Zumerle, G.
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Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung:From a sample of about 120 000 hadronic Z 0 decays, using a technique based on a separation of the different event categories in the boosted sphericity product, the fraction of b b decays has been measured to be 0.219 ± 0.014 (stat)± 0.019 (syst). Using the DELPHI determination of the hadronic Z 0 width, this corresponds to a partial width τ b b = 378 ± 42 MeV (in good agreement with the standard model prediction of ∼-380 MeV). Combining this measurement with the determinations based on events with high p t leptons gives an estimate for the branching ratio of b into leptons at LEP of (11.2 ± 1.2)%, consistent with previous determinations.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(92)91159-7