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Adam, W; Albrecht, T; Alemany-Fernandez, R; Allport, P; Amaldi, U; Andringa, S; Antilogus, P; Apel, WD; Asman, B; Baillon, P; Ballestrero, A; Barbier, R; Begalli, M; Benekos, N; Bloch, D; Blom, M; Bonesini, M; Botner, O; Boyko, I; Brenner, R; Brodet, E; Bruckman, P; Brunet, M; Calvi, M; Camporesi, T; Castro, N; Checchia, P; De Angelis, A; De Min, A; Doroba, K; Dris, M; Eigen, G; Santo, CE; Ferrer, A; Flagmeyer, U; Foeth, H; Gandelman, M; Garcia, C; Golob, B; Gomez-Ceballos, G; Grosdidier, G; Grzelak, K; Haag, C; Hedberg, Vincent; Hennecke, M; Herr, H; Hultqvist, K; Johansson, K; Joram, C; Katsanevas, S; Kluit, P; Kouznetsov, O; Lamsa, J; Lepeltier, V; Loukas, D; Maltezos, S; Marco, J; Matteuzzi, C; Mjörnmark, Ulf; Moraes, D; Muryn, B; Nicolaidou, R; Oblakowska-Mucha, A; Obraztsov, V; Olshevski, A; Orava, R; Ouraou, A; Paganoni, M; Paiano, S; Pape, L; Parodi, F; Passeri, A; Perrotta, A; Polok, G; Pozdniakov, V; Ramler, L; Rehn, J; Rivero, M; Romero, A; Roudeau, P; Savoy-Navarro, A; Sisakian, A; Sopczak, A; Sosnowski, R; Spassov, T; Tegenfeldt, F; Tkatchev, L; Tortosa, P; Travnicek, P; Treille, D; Troncon, C; Van Eldik, J; Van Vulpen, I; Vegni, G; Veloso, F; Verdier, P; Vilanova, D; Wickens, J; Yushchenko, O; Zupan, M
The European physical journal. C, Particles and fields, 06/2004, Letnik: 35, Številka: 1Journal Article
Oscillations in the B-s(0)- <(B-s(0))over bar> system were studied in events selected from about 4.3 million hadronic Z(0) decays registered by DELPHI between 1992 and 2000. This paper presents updates of two published analyses (11, 12). The first analysis, which utilizes leptons emitted with large momentum transverse to a jet, was improved by means of a better algorithm for the vertex reconstuction and a new algorithm for flavour-tagging at production time. The second analysis, which utilizes D-s-lepton events, was improved by optimizing the treatment of proper time resolution. No signal of B-s(0) oscillations was observed and limits on the mass difference between the physical B-s(0) states were obtained to be: Deltam(s)>8.0 ps-1 at the 95% C.L. with a sensitivity of Deltam(s)= 9.1 ps(-1) in the high p(t) lepton analysis and Deltam(s)>4.9 ps(-1) at the 95% C.L. with a sensitivity of Deltam(s)=8.6 ps(-1) in the D-s-lepton analysis. Previously published results on these analyses are superseded. The combination of these results with those obtained in other independent analyses previously performed in DELPHI (D-s-hadron, exclusive B-s(0), inclusive vertex) gives: Deltam(s)>8.5 ps(-1) at the 95% C.L. with a sensitivity of Deltam(s)=12.0 ps(-1).
