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Adam, W; Albrecht, T; Alemany-Fernandez, R; Allport, PP; Amaldi, U; Anashkin, E; Andringa, S; Antilogus, P; Apel, WD; Asman, B; Baillon, P; Ballestrero, A; Barbier, R; Begalli, M; Benekos, N; Berat, C; Bloch, D; Blom, M; Bonesini, M; Botner, O; Bowcock, TJV; Boyko, I; Brenner, R; Brodet, E; Bruckman, P; Brunet, JM; Calvi, M; Camporesi, T; Carena, F; Castro, N; Checchia, P; Crennell, D; D'Hondt, J; Da Silva, W; De Angelis, A; De Boer, W; de Paula, L; Doroba, K; Ekelof, T; Ferrer, A; Fokitis, E; Garcia, C; Gavillet, P; Graziani, E; Guy, J; Haag, C; Hamacher, K; Haug, S; Holt, PJ; Jarlskog, Göran; Jungermann, L; Kapusta, F; Kernel, G; Kucharczyk, M; Leinonen, L; Malek, A; Maltezos, S; Marco, J; Marin, JC; Masik, J; McNulty, R; Migliore, E; Moreno, S; Mulders, M; Myklebust, T; Nikolenko, M; Osterberg, K; Oyanguren, A; Palacios, JP; Perepelitsa, V; Piedra, J; Pieri, L; Poireau, V; Pol, ME; Poropat, P; Pukhaeva, N; Rames, J; Read, A; Reid, D; Renton, P; Richard, F; Ryabtchikov, D; Salmi, L; Schwickerath, U; Segar, A; Sekulin, R; Smadja, G; Smirnova, Oxana; Sopczak, A; Stanitzki, M; Tobin, M; Tome, B; Troncon, C; Van Lysebetten, A; Wahlen, H; Wilkinson, G; Winter, M; Zalewski, P; Zimin, NI; Zintchenko, A
Physics letters. B, 04/2004, Letnik: 585, Številka: 1-2Journal Article
The form factor of A(o)(b) baryons is estimated using 3.46 x 10(6) hadronic Z decays collected by the DELPM experiment between 1992 and 1995. Charmed A(c)(+) baryons fully reconstructed in the pK(-)pi(+), pK(o)(s), and Api(+)pi(+)pi(-) modes, are associated to a c S lepton with opposite charge in order to select A(o)(b) --> A(c)(+)l(-)v(l) decays. From a combined likelihood and event rate fit to the b C distribution of the Isgur-Wise variable w, and using the Heavy Quark Effective Theory (HQET), the slope of the b-baryon form factor is measured to be p(2)=2.03+/-0.46(stat)(-1.00)(+0.72)(syst). The exclusive semileptonic branching fraction Br(A(b)(o) --> A(c)(+)l(-)v(l)) can be derived from p(2) and is found to be (5.0(-0.8)(+1.1)(stat)(-1.2)(+1.6) (syst))%. Limits on other branching fractions are also obtained. (C) 2004 Published by Elsevier B.V.
