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Adam, W; Albrecht, T; Alemany-Fernandez, R; Allport, PP; Amaldi, U; Andringa, S; Antilogus, P; Apel, WD; Asman, B; Baillon, P; Ballestrero, A; Barbier, R; Battaglias, M; Begalli, M; Benekos, N; Bloch, D; Blom, M; Bonesini, M; Botner, O; Bowcoek, TJV; Boyko, I; Brenner, R; Brodet, E; Bruckman, P; Brunet, JM; Camporesi, T; Canale, V; Carena, F; Chudoba, J; Collins, P; Cosme, G; De Clercq, C; Di Simone, A; Drees, J; Eigen, G; Santo, MCE; Feindt, M; Fernandez, J; Ferro, F; Gandelman, M; Gazis, E; Goncalves, P; Guy, J; Hallgren, A; Hamacher, K; Hauler, F; Herr, H; Jackson, JN; Johansson, EK; Jungermann, L; Katsoufis, E; Kersevan, BP; Kerzel, U; King, BT; Kokkinias, P; Krumstein, Z; Lemonne, J; Lesiak, T; Lopes, JH; Lutz, P; MacNaughton, J; Marechal, B; Mariottis, C; Markou, A; Matorras, F; Mazzucato, M; Mighore, E; Moreno, S; Morettini, P; Mulders, M; Murray, W; Myklebust, T; Osterberg, K; Oyanguren, A; Parzefall, U; Passo, O; Perepelitsa, V; Piedra, J; Pieri, L; Podobnik, T; Rames, J; Rehn, J; Reinhardt, R; Romero, A; Sopezak, A; Strauss, J; Timmermans, J; Tonazzo, A; Trochimczuk, M; Turluer, ML; Tyapkin, IA; Tzamarias, S; Uvarov, V; Valenti, G; Van Dam, P; van Remortel, N; Vegni, G; Veloso, F; Yushchenko, O; Zalewska, A
European physical journal. C, Particles and fields, 11/2005, Letnik: 44, Številka: 3Journal Article
The charmed strange baryon Xi(c)(0) was searched for in the decay channel Xi(c)(0) -> Xi(-)pi(+), and the beauty strange baryon Xi(b) in the inclusive channel Xi(b) -> Xi(-)l(-)(nu) over barX, using the 3.5 million hadronic Z events collected by the DELPHI experiment in the years 1992-1995. The Xi(-) was reconstructed through the decay AT, using a constrained fit method for cascade decays. An iterative discriminant analysis was used for the Xi(c)(0) and Xi(b) selection. The production rates were measured to be f(Xi c)(0) x BR(Xi(c)(0) -> Xi(-)pi(+) = (4.7 +/- 1.4(stat.) +/- 1.1(syst.)) x 10(-4) per hadronic Z decay, and BR(b -> Xi(b))xBR(Xi(b) -> Xi(-)l(-)X) = (3.0 +/- 1.0(stat.) +/- 0.3(syst.)) x 10(-4) for each lepton species (electron or muon). The lifetime of the Xi(b) baryon was measured to be tau(Xi b) = 1.45(-0.43)(+0.55)(stat.)+/- 0.13(syst.) ps. A combination with the previous DELPHI lifetime measurement gives tau(Xi b) = 1.48(-0.31)(+0.40)(stat.)+/- 0.12(syst.) ps.
