Charged-Particle Pair Production Associated With A Lepton Pair In Z-Decays - Indication Of An Excess In The Tau Channel

D. Decamp,B. Deschizeaux, C. Goy, J.-P. Lees,M.-N. Minard,R. Alemany,J.M. Crespo,M. Delfino,E. Fernandez,V. Gaitan, Ll. Garrido,Ll.M. Mir,A. Pacheco,M.G. 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, W.B. Atwood,L.A.T. Bauerdick,F. Bird,E. Blucher,G. Bonvicini,F. Bossi,D. Brown,T.H. Burnett, H. Drevermann,R.W. Forty,C. Grab,R. Hagelberg,S. Haywood,J. Hilgart,B. Jost,M. Kasemann,J. Knobloch,A. Lacourt,E. Lançon,I. Lehraus, T. Lohse,A. Marchioro,M. Martinez,P. Mato,S. Menary,A. Minten,A. Miotto,R. Miquel, H.-G. Moser,J. Nash,P. Palazzi,F. Ranjard,G. Redlinger,A. Roth, J. Rothberg,H. Rotscheidt,R. St.Denis,D. Schlatter,M. Takashima,M. Talby,W. Tejessy,H. Wachsmuth, S. Wasserbaech,S. Wheeler,W. Wiedenmann,W. Witzeling, J. Wotschack,W. Wu, Z. Ajaltouni,M. Bardadin-Otwinowska,A. Falvard,R. El Fellous, P. Gay,J. Harvey, P. Henrard,J. Jousset,B. Michel,J.-C. Montret, D. Pallin, P. Perret,J. Proriol,F. Prulhière,G. Stimpfl,J.D. Hansen,J.R. Hansen,P.H. Hansen,R. Møllerud,E.R. Nielsen,B.S. Nilsson,I. Efthymiopoulos,E. Simopoulou,A. Vayaki,J. Badier, A. Blondel,G. Bonneaud,J. Bourotte,F. Braems,J.C. Brient,G. Fouque,A. Gamess,R. Guirlet,S. Orteu, A. Rosowsky,A. Rougé,M. Rumpf, R. Tanaka,H. Videau,D.J. Candlin,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,F. Cerutti,V. Chiarella,B. D'Ettorre-Piazzoli,G. Felici,P. Laurelli,G. Mannocchi,F. Murtas,G.P. Murtas,G. Nicoletti,L. Passalacqua,M. Pepe-Altarelli,P. Picchi,P. Zografou,B. Altoon,O. Boyle,A.W. Halley,I. ten Have,J.L. Hearns,J.G. Lynch,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, P.J. Dornan,S. Dugeay,A.M. Greene,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,N.R. Keemer,M. Nuttall,A. Patel,B.S. Rowlingson, T. Sloan,S.W. Snow,E.P. Whelan,T. Barczewski, K. Kleinknecht,J. Raab,B. Renk,S. Roehn, H.-G. Sander,M. Schmelling,H. Schmidt,F. Steeg,S.M. Walther,B. Wolf,J.-P. Albanese, J.-J. Aubert, C. Benchouk,V. Bernard,A. Bonissent,D. Courvoisier, F. Etienne,S. Papalexiou,P. Payre, B. Pietrzyk,Z. Qian,H. Becker, W. Blum,P. Cattaneo,G. Cowan,B. Dehning,H. Dietl, F. Dydak,M. Fernandez-Bosman,T. Hansl-Kozanecka,A. Jahn, W. Kozanecki,E. Lange,J. Lauber,G. Lütjens, G. Lutz,W. Männer, Y. Pan,R. Richter, J. Schröder, A.S. Schwarz,R. Settles,U. Stierlin,J. Thomas,G. Wolf,V. Bertin,J. Boucrot, O. Callot,X. Chen,A. Cordier,M. Ganis,J.-F. Grivaz,Ph. Heusse, P. Janot, D.W. Kim,F. Le Diberder,J. Lefrançois,A.-M. Lutz,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, A. Giassi,M.A. Giorgi,F. Ligabue,A. Lusiani,E.B. Mannelli,P.S. Marrocchesi, A. Messineo,L. Moneta,F. Palla,G. Sanguinetti,J. Steinberger, R. Tenchini,G. Tonelli,G. Triggiani,C. Vannini,A. Venturi,P.G. Verdini, J. Walsh,J.M. Carter, M.G. Green,P.V. March,T. Medcalf,I.S. Quazi,M.R. Saich,J.A. Strong,R.M. Thomas,L.R. West,T. Wildish,D.R. Botterill, R.W. Clifft,T.R. Edgecock,M. Edwards,S.M. Fisher,T.J. Jones,P.R. Norton,D.P. Salmon,J.C. Thompson,B. Bloch-Devaux,P. Colas,C. Klopfenstein, E. Locci,S. Loucatos, E. Monnier,P. Perez,J.A. Perlas,F. Perrier, J. Rander,J.-F. Renardy,A. Roussarie,J.-P. Schuller, J. Schwindling,B. Vallage,J.G. Ashman,C.N. Booth,C. Buttar,R. Carney,S. Cartwright,F. Combley,M. Dinsdale,M. Dogru,F. Hatfield,J. Martin,D. Parker,P. Reeves,L.F. Thompson,S. Brandt,H. Burkhardt, C. Grupen,H. Meinhard, L. Mirabito,E. Neugebauer,U. Schäfer,H. Seywerd, G. Apollinari,G. Giannini,B. Gobbo,F. Liello, F. Ragusa,L. Rolandi,U. Stiegler, L. Bellantoni,J.F. Boudreau,D. Cinabro,X. Chen,J.S. Conway,D.F. Cowen,Z. Feng,D.P.S. Ferguson, Y.S. Gao,J. Grahl,J.L. Harton,J.E. Jacobsen,R.C. Jared,R.P. Johnson, B.W. LeClaire, Y.B. Pan,J.R. Pater,Y. Saadi, V. Sharma,Z.H. Shi,Y.H. Tang,A.M. Walsh,J.A. Wear,F.V. Weber,M.H. Whitney,Lan Wu Sau, G. Zobernig

PHYSICS LETTERS B（1991）

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摘要

In a sample of 200 000 Z decays, events with two leptons and an additional pair of charged particles are studied. The 35 events found show a possible excess in the tau channel compared with the expectation from electroweak processes. The features of the events are consistent with radiation of virtual photons.

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关键词

charged particles,particle physics

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