J/Psi-production in the hadronic decays of the Z

Abreu, P; Adam, W; Adye, T; Agasi, E; Ajinenko, I; Aleksan, R; Alekseev, Gd; Allport, Pp; Almehed, S; Almeida, Fml; Alvsvaag, Sj; Amaldi, U; Andreazza, A; Antilogus, P; Apel, Wd; Apsimon, Rj; Arnoud, Y; Asman, B; Augustin, Je; Augustinus, A; Baillon, P; Bambade, P; Barao, F; Barate, R; Barbiellini, G; Bardin, Dy; Barker, Gj; Baroncelli, A; Barring, O; Barrio, Ja; Bartl, W; Bates, Mj; Battaglia, M; Baubillier, M; Baudot, J; Becks, Kh; Begalli, M; Beilliere, P; Beltran, P; Benvenuti, Ac; Berggren, M; Bertrand, D; Bianchi, F; Bigi, M; Bilenky, Ms; Billoir, P; Bjarne, J; Bloch, D; Blocki, J; Blyth, S; Bocci, V; Bogolubov, Pn; Bolognese, T; Bonesini, M; Bonivento, W; Booth, Psl; Borisov, G; Bosio, C; Bostjancic, B; Bosworth, S; Botner, O; Bouquet, B; Bourdarios, C; Bowcock, Tjv; Bozzo, M; Braibant, S; Branchini, P; Brand, Kd; Brenner, Ra; Briand, H; Bricman, C; Brillault, L; Brown, Rca; Bruckman, P; Brunet, Jm; Bugge, L; Buran, T; Buys, A; Buytaert, Jama; Caccia, Massimo; Calvi, M; Rozas, Ajc; 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doi:10.1016/0370-2693(94)01385-3

J/psi mesons have been reconstructed from their decay to mu(+)mu(-) and e(+)e(-), using the data collected by the DELPHI experiment during 1991 and 1992 at the LEP collider. From about 1 million hadronic Z decays 153 +/- 17 J/psi were found, 5.4 +/- 2.3 psi' were obtained in the channel J/psi(--> mu(+)mu(-))pi(+)pi(-) and 6.4 +/- 2.7 chi(c) in the channel J/psi(--> mu(+)mu(-))gamma. As the dominant source of J/psi mesons is from b quarks, the following branching ratios: Br(b-->J/psi X) = (1.12 +/- 0.12 (stat.) +/- 0.10 (syst.))%, Br(b --> psi' X) = (0.48 +/- 0.22 (stat.) +/- 0.10 (syst.))%, Br(b-->chi(cl) X) = (1.4 +/- 0.6 (stat.)(-0.2)(+0.4) (syst.))% were measured. From the proper time distribution of the J/psi sample, the average lifetime of b-hadrons decaying into J/psi was found to be: tau(B) = 1.50(-0.21)(+0.24) (stat.) +/- 0.03 (syst.) ps. A search for completely reconstructed B meson decays to final states including a J/psi gave a signal of 15 +/- 5 events.