Measurement of the [formula omitted] mixing parameter in DELPHI

• Published in: Physics letters. B 1994-07, Vol.332 (3), p.488-500
• Main Authors: Abreu, P., Aleksan, R., Almehed, S., Almeida, F.M.L., Amaldi, U., Åsman, B., Barbiellini, G., Begalli, M., Beltran, P., Bianchi, F., Bosio, C., Bouquet, B., Bozzo, M., Branchini, P., Briand, H., Brown, R.C.A., Canale, V., Cases, R., Caso, C., Castillo Gimenez, M.V., Chabaud, V., Charpentier, Ph, Chelkov, G.A., Crawley, H.B., Dahl-Jensen, E., De Boer, W., De Clercq, C., Donszelmann, M., Engel, J-P., Fassouliotis, D., Fousset, J-L., Francon, S., Gopal, G., Haedinger, U., Hahn, F., Hahn, M., Hernando, J.A., Herr, H., Houlden, M., Jarlskog, G., Kaiser, M., Klovning, A., Koehne, J.H., Korytov, A.V., Kramer, P.H., Kronkvist, I., Lambropoulos, C., Lamsa, J.W., Lapin, V., Last, I., Laugier, J-P., Lesiak, T., Loken, J.G., Maehlum, G., Matorras, F., Meroni, C., Meyer, W.T., Moa, T., Monge, M.R., Murray, W.J., Novak, M., Palka, H., Papadopoulou, Th.D., Peralta, L., Pierre, F., Poropat, P., Privitera, P., Radojicic, D., Ratoff, P.N., Read, A.L., Reid, D., Roudeau, P., Sciolla, G., Sessa, M., Seufert, R., Simonetti, S., Smadja, G., Smirnov, N., Smirnova, O., Spiriti, E., Stocchi, A., Szeptycka, M., Tabarelli, T., Tchikilev, O., Tilquin, A., Tristram, G., Tsirou, A., Turala, M., Tuuva, T., Van Apeldoorn, G.W., Venus, W., Vertogradov, L.S., Vollmer, M., Waldner, F., Wehr, A., Wickens, J.H., Witek, M., Zevgolatakos, E., Zito, M., Zontar, D.
• Format: Article
• Language: English
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(94)91285-8

A total of about 900 000 Z 0 → q q decays have been analyzed to measure the B 0 B 0 mixing probability. Two different b tagging techniques have been used: events with two leptons and events with one lepton and one Λ. From a combination of the two methods the average mixing parameter, χ, was determined to be (12.1±1.6(stat.)±0.4(syst.)±0.4(model)%.