Measurement Of B-Bbar Mixing At The Z

D Decamp, B Deschizeaux, C Goy,Jp Less,Mn Minard,R Alemany,Jm Crespo, M Delfino, E Fernandez, V Gaitan, L Garrido, P Mato, R Miquel, Lm Mir, S Orteu, A Pacheco, Ja Perlas, E Tubau,Mg Catanesi, D Creanza, M De Palma, A Farilla, G Iaselli, G Maggi, M Maggi, S Natali, S Nuzzo, M Quattromini, A Ranieri, G Raso, F Romano, F Ruggieri, G Selvaggi, L Silvestris, P Tempesta, G Zito, Y Gao, H Hu, D Huang, X Huang, J Lin, J Lou, C Qiao, T Ruan, T Wang, Y Xie, D Xu, R Xu, J Zhang, W Zhao, H Albrecht,Wb Atwood, F Bird, E Blucher, G Bonvicini, F Bossi, D Brown,Th Burnett, H Drevermann, F Dydak, Rw Forty, C Grab, R Hagelberg, S Haywood, B Jost, M Kasemann, G Kellner, J Knobloch, A Lacourt, I Lehraus, T Lohse, D Luke, A Marchioro, M Martinez, J May, S Menary, A Minten, A Miotto, J Nash, P Palazzi, F Ranjard, G Redlinger, A Roth, J Rothberg, H Rotscheidt,W Von Ruden, R St Denis, D Schlatter, M Takashima, M Talby, W Tejessy, H Wachsmuth, S Wassebaech, S Wheeler, W Wiedenmann, W Witzeling, J Wotschack, Z Ajaltouni, M Bardadin-Otwinowska, A Falvard,R El Fellous, P Gay, J Harvey, P Henrard, J Jousset, B Michel,Jc Montret, D Pallin, P Perret, J Proriol, F Prulhiere, G Stimpfl,Jd Hansen, Jr Hansen,Ph Hansen, R Mollerud, Er Nielsen, Bs Nilsson, I Efthymiopoulos, E Simopoulou, A Vayaki, J Badier, A Blondel, G Bonneaud, J Bourotte, F Braems,Jc Brient, G Fouque, A Gamess, R Guirlet, A Rosowsky, A Rouge, M Rumpf, R Tanaka, H Videau, Dj Candin, E Veitch, G Parrini, M Corden, C Georgiopoulos, M Ikeda, J Lannutti, D Levinthal, M Mermikides, L Sawyer, A Antonelli, R Baldini, G Bencivenni, G Bologna, P Campana, G Capon, V Chiarella, B D'Ettorre-Piazzoli, G Felici, P Laurelli, G Mannocchi, F Massimo-Brancaccio, F Murtas, Gp Murtas, G Nicoletti, L Passalacqua, M Pepe-Altarelli, P Picchi, P Zografou, B Altoon, O Boyle,Aw Halley,I Ten Have,Jl Hearns, Jg Lynch,Wt Morton, C Raine,Jm Scarr, K Smith, As Thompson,Rm Turnbull, B Brandl, O Braun, R Geiges, C Geweniger, P Hanke, V Hepp, Ee Kluge, Y Maumary, A Putzer, B Rensch, A Stahl, K Tittel, M Wunsch,At Belk, R Beuselinck,Dm Binnie, W Cameron, M Cattaneo,Pj Dornan, S Dugeay, Am Greene,Jf Hassard,Nm Lieske,Sj Patton,Dg Payne,Mj Phillips,Jk Sedgbeer, G Taylor, Ir Tomalin,Ag Wright, P Girtler, D Kuhn, G Rudolph, Ck Bowdery,Tj Brodbeck, Aj Finch, F Foster, G Hughes, Nr Keemer, M Nuttall, A Patel,Bs Rowlingson, T Sloan,Sw Snow, Ep Whelan, T Barczewski,Lat Bauerdick, K Kleinknecht, B Renk, S Roehn, Hg Sander, M Schmelling, H Schmidt, F Steeg,Jp Albanese, Jj Aubert, C Benchouk, V Bernard, A Bonissent, D Courvoisier, F Etienne, S Papalexiou, P Payre, B Pietrzyk, Z Qian, W Blum, P Cattaneo, G Cowan, B Dehning, H Dietl, M Fernandez-Bosman, T Hansl-Kozanecka, A Jahn, W Kozanecki, E Lange, G Lutjens, G Lutz, W Manner, Hg Moser,Y Pan, R Richter, J Schroder,As Schwarz, R Settles, U Stierlin, J Thomas, G Wolf, V Bertin,G De Bouard, J Boucrot, O Callot, X Chen, A Cordier, M Davier, G Ganis, Jf Grivaz, P Heusse, P Janot, V Journe,Dw Kim, J Lefrancois, Am Lutz, Jj Veillet, I Videau, Z Zhang, F Zomer,Sr Amendolia, G Bagliesi, G Batignani, L Bosisio, U Bottigli, C Bradaschia, M Carpinelli,Ma Ciocci,R Dell'Orso, I Ferrante, F Fidecaro, L Foa, E Focardi, F Forti, A Giassi, Am Giorgi, F Ligabue, A Lusiani,Eb Mannelli, Ps Marrochesi, A Messineo, L Moneta, F Palla, G Sanguinetti, J Steinberger, R Tenchini, G Tonelli, G Triggiani, C Vannini-Castaldi, A Venturi, Pg Verdini, J Walsh, Jm Carter,Mg Green,Pv March, T Medcalf,Is Quazi,Mr Saich, Ja Strong,Rm Thomas, Lr West, T Wildish,Dr Botterill,Rw Clifft, Tr Edgecock, M Edwards, Sm Fischer,Tj Jones,Pr Norton, Salmon Dp,Jc Thompson, B Bloch-Devaux, P Colas, C Klopfenstein, E Lancon, E Locci, S Loucatos, E Monnier, P Perez, F Perrier, J Rander,Jf Renardy, A Roussarie,Jp Schuller, J Schwindling,Jg Ashman,Cn Booth, C Buttar, R Carney, S Cartwright, F Combley, M Dinsdale, M Dogru, F Hatfield, J Martin, D Parker, P Reeves, Lf Thompson, S Brandt, H Burkhardt, C Grupen, H Meinhard, L Mirabito, E Neugebauer, U Schafer, H Seywerd, G Apollinari, G Giannini, B Gobbo, F Liello, L Rolandi, U Stiegler, L Bellantoni,Jf Boudreau, D Cinabro,Js Conway,Df Cowen, Aj Deweerd, Z Feng, Dps Ferguson, Ys Gao, J Grahl, Ji Harton, J Hilgart,Je Jacobsen,Rc Jared,Rp Johnson,Bw Leclaire,Yb Pan,Jr Pater, Y Saadi, V Sharma,Am Walsh,Ja Wear,Fv Weber,Mh Whitney,Sl Wu, Zi Zhou, G Zobernig

PHYSICS LETTERS B（1991）

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摘要

From more than 175 000 hadronic Z decays observed with the ALEPH detector at LEP, we select 823 events with pairs of leptons in the final state. From these we measure-chi, the probability that a b hadron which is observed to decay originated as a bBAR hadron. We find chi = 0.132(-0.026)+0.027.

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