Measurement Of B-(B)Bar Mixing At The Z Using A Jet-Charge Method

D. Buskulic,D. Decamp, C. Goy, J.-P. Lees,M.-N. Minard,B. Mours,R. Alemany,F. Ariztizabal,P. Comas,J.M. Crespo,M. Delfino,E. Fernandez,V. Gaitan, Ll. Garrido,Ll.M. Mir,A. Pacheco,A. Pascual, 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. Wang,Y. Xie,D. Xu, R. Xu,J. Zhang,W. Zhao,W.B. Atwood, L.A.T. Bauerdick,E. Blucher,G. Bonvicini,F. Bossi, J. Boudreau,T.H. Burnett, H. Drevermann,R.W. Forty,R. Hagelberg,S. Haywood,J. Hilgart,R. Jacobsen, B. Jost,J. Knobloch,E. Lançon,I. Lehraus, T. Lohse,A. Lusiani,M. Martinez,P. Mato, T. Mattison,H. Meinhard, S. Menary,T. Meyer, A. Minten, A. Miotto,R. Miquel, H.-G. Moser,J. Nash,P. Palazzi,J.A. Perlas,F. Ranjard,G. Redlinger,L. Rolandi,A. Roth, J. Rothberg,T. Ruan,M. Saich,D. Schlatter,M. Schmelling,F. Sefkow,W. Tejessy,H. Wachsmuth,W. Wiedenmann,T. Wildish,W. Witzeling, J. Wotschack, Z. Ajaltouni,F. Badaud,M. Bardadin-Otwinowska,A.M. Bencheikh,R. El Fellous,A. Falvard, P. Gay, C. Guicheney, P. Henrard,J. Jousset,B. Michel,J.-C. Montret, D. Pallin, P. Perret, B. Pietrzyk,J. Proriol,F. Prulhière,G. Stimpfl,T. Fearnley,J.D. Hansen,J.R. Hansen,P.H. Hansen,R. Møllerud,B.S. Nilsson,I. Efthymiopoulos, A. Kyriakis,E. Simopoulou,A. Vayaki,K. Zachariadou,J. Badier, A. Blondel,G. Bonneaud,J.C. Brient,G. Fouque,A. Gamess,J. Harvey,S. Orteu, A. Rosowsky,A. Rougé,M. Rumpf, R. Tanaka,H. Videau,D.J. Candlin,M.I. Parsons,E. Veitch,L. Moneta,G. Parrini,M. Corden,C. Georgiopoulos,M. Ikeda,J. Lannutti,D. Levinthal,M. Mermikides,L. Sawyer, S. Wasserbaech,A. Antonelli,R. Baldini, G. Bencivenni,G. Bologna, P. Campana,G. Capon,F. Cerutti,V. Chiarella,B. D'Ettorre-Piazzoli,P. Felici,P. Laurelli, G. Mannocchu,F. Murtas,G.P. Murtas,L. Passalacqua,M. Pepe-Altarelli,P. Picchi,B. Altoon,O. Boyle,P. Colrain,I. ten Have,J.G. Lynch,W. Maitland, W.T. Morton,C. Raine,J.M. Scarr,K. Smith, A.S. Thompson,R.M. Turnbull,B. Brandl,O. Braun,R. Geiges, C. Geweniger, P. Hanke,V. Hepp,E.E. Kluge,Y. Maumary,A. Putzer,B. Rensch,A. Stahl,K. Tittel,M. Wunsch,A.T. Belk,R. Beuselinck, D.M. Binnie,W. Cameron,M. Cattaneo,D.J. Colling, P.J. Dornan,S. Dugeay,A.M. Greene,J.F. Hassard,N.M. Lieske,S.J. Patton,D.G. Payne,M.J. Phillips,J.K. Sedgbeer,G. Taylor,I.R. Tomalin,A.G. Wright,P. Girtler, D. Kuhn, G. Rudolph,C.K. Bowdery,T.J. Brodbeck,A.J. Finch,F. Foster, G. Hughes,D. Jackson,N.R. Keemer,M. Nuttall,A. Patel, T. Sloan,S.W. Snow,E.P. Whelan,T. Barczewski, K. Kleinknecht,J. Raab,B. Renk,S. Roehn, H.-G. Sander,H. Schmidt,F. Steeg, S.M. Walther,B. Wolf,J.-J. Aubert, C. Benchouk,V. Bernard,A. Bonissent,J. Carr,P. Coyle,J. Drinkard, F. Etienne,S. Papalexiou,P. Payre,Z. Qian,D. Rousseau,P. Schwemling, M. Talby,S. Adlung,H. Becker, W. Blum,D. Brown,P. Cattaneo,G. Cowan,B. Dehning,H. Dietl, F. Dydak,M. Fernandez-Bosman,M. Frank,A.W. Halley,T. Hansl-Kozanecka,J. Lauber,G. Lütjens, G. Lutz,W. Männer, Y. Pan,R. Richter,H. Rotscheidt, J. Schröder, A.S. Schwarz,R. Settles,U. Stierlin,U. Stiegler,R. St. Denis,M. Takashima,J. Thomas,G. Wolf,V. Bertin,J. Boucrot, O. Callot,X. Chen,A. Cordier, M. Davier,J.-F. Grivaz,Ph. Heusse, P. Janot, D.W. Kim,F. Le Diberder,J. Lefrançois,A.-M. Lutz,M.-H. Schune,J.-J. Veillet, I. Videau,Z. Zhang,F. Zomer, D. Abbaneo,S.R. Amendolia,G. Bagliesi,G. Batignani,L. Bosisio,U. Bottigli,C. Bradaschia,M. Carpinelli,M.A. Ciocci,R. Dell'Orso,I. Ferrante,F. Fidecaro, L. Foà, E. Focardi,F. Forti,C. Gatto, A. Giassi,M.A. Giorgi,F. Ligabue, E.B. Mannelli,P.S. Marrocchesi, A. Messineo,F. Palla,G. Rizzo,G. Sanguinetti,J. Steinberger, R. Tenchini,G. Tonelli,G. Triggini,C. Vannini,A. Venturi,P.G. Verdini, J. Walsh,J.M. Carter, M.G. Green,P.V. March,T. Medcalf,I.S. Quazi,J.A. Strong,L.R. West,D.R. Botterill, R.W. Clifft,T.R. Edgecock,M. Edwards,S.M. Fischer,T.J. Jones,P.R. Norton,D.P. Salmon,J.C. Thompson,B. Bloch-Devaux,P. Colas, W. Kozanecki,M.C. Lemaire, E. Locci,S. Loucatos, E. Monnier,P. Perez,F. Perrier, J. Rander,J.-F. Renardy,A. Roussarie,J.-P. Schuller, J. Schwindling,D. Si Mohand,B. Vallage,R.P. Johnson,A.M. Litke,J. Wear,J.G. Ashman,W. Babbage,C.N. Booth,C. Buttar,R.E. Carney,S. Cartwright,F. Combley,F. Hatfield,J. Martin,P. Reeves,L.F. Thompson, E. Barberio,S. Brandt, C. Grupen, L. Mirabito,U. Schäfer,H. Seywerd,G. Ganis,G. Giannini,B. Gobbo,F. Ragusa, L. Bellantoni,D. Cinabro,J.S. Conway,D.F. Cowen,Z. Feng,D.P.S. Ferguson,Y.S. Gao,J. Grahl,J.L. Harton,R.C. Jared,B.W. LeClaire,C. Lishka, Y.B. Pan,J.R. Pater,Y. Saadi, V. Sharma, M. Schmitt,Z.H. Shi,Y.H. Tang,A.M. Walsh,F.V. Weber,M.H. Whitney,Sau Lan Wu,X. Wu, G. Zobernig

PHYSICS LETTERS B（1992）

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摘要

Results on B0-BBAR0 mixing in e+e- annihilation at LEP are reported. A new method is used, where the charge of one b quark is tagged by a high-p, high-p(perpendicular-to) electron or muon, and the charge of the other is extracted from the momentum-weighted average of the charges of jet fragments. Based on the analysis of 180000 hadronic Z decays produced in the ALEPH detector, f(d-chi-d) + 0.72f(s-chi-s) = 0.113 +/- 0.018 (stat.) +/- 0.027 (syst.) is obtained. Combining this result with the ALEPH dilepton measurement yields chi = 0.129 +/- 0.022.

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