Measurement of W-pair production in e+e- collisions at 189 GeV: ALEPH collaboration

R. Barate,D. Décamp,Ph Ghez,Corinne B. Goy,Stephane Jézéquel,Jean Pierre Lees,Françoise F. Martin,E. Merle,Marie Noelle Minard,Bolek Pietrzyk,Ricard Alemany,S. Bravo,M. P. Casado,Mokhtar A. Chmeissani,José M. Crespo,Enrique Fernández,M. Fernandez-Bosman,Ll C. Garrido,Eugeni S. Graugés,Mauricio C. Martínez, G. Merino,Ramon Miquel,Ll M. Mir,Alberto J. Pacheco,Hugo S. Ruiz,Anna Colaleo,Donato Creanza,Mauro De Palma,Giuseppe Iaselli,Giorgio Pietro Maggi,Marcello Maggi,Salvatore Nuzzo,Antonio Ranieri,Giuseppe Raso,Federico Ruggierí,G. Selvaggi,Lucia Silvestris,Piergiulio Tempesta, Alessia Tricomi,Giuseppe Zito,Xiuping Huáng,Jim Lin,Qun Ouyang,Taijie Wang,Yi Xie,Rui Xu,Shengtian Xue,Jian Zhang,Lei Zhang,Wei Zhao,Duccio Abbaneo,Gaëlle Boix,O. L. Büchmüller,Marco Cattaneo,Francesco Cerutti,Günther Dissertori,Hans Drevermann,Roger W. Forty,Markus J. Frank,Fabiola Gianotti,T. C. Greening,A. W. Halley,Jørgen Beck Hansen,Jeffrey A. Harvey,Patrick Janot,Beat Jost,Marumi Kado,Vincent Lemaître,P. D. Maley,Pere Mató,A. Minten,A. Moutoussi,Florence Ranjard,Luigi Rolandi,Dieter Schlatter,Michael Schmitt,Olivier Schneider,Paolo Spagnolo,W. Tejessy,Frederic Teubert,Edwige Tournefier,Andrea Valassi,Jonathan J. Ward,Alison E. Wright,Zeina J. Ajaltouni,Frédérique Badaud,G. Chazelle,Olivier Deschamps,S. Dessagne,A. Falvard,Pascal Gay,C. J. Guicheney,Pierre Henrard,J. C. Jousset,B. Michel,Stéphane Monteil,J. C. Montret,Dominique Pallin,J. M. Pascólo,Pascal Perret, F. Podlyski,Jakob Dines Hansen,John Renner Hansen,Philip H. Hansen,Björn S. Nilsson,Anders Wäänänen,Georgios Daskalakis, A. Kyriakis,Christos T. Markou,E. Simopoulou,A. Vayaki,Alain P. Blondel,Jean Claude Brient,Frédéric MacHefert,André Rougé,M. Swynghedauw,Reisaburo Tanaka,Henri Videau,Ettore Focardi,Giuliano Parrini,K. Zachariadou,Angelo Antonelli,Giorgio Bencivenni,G. F. Bologna,Fabio C. Bossi,Pierluigi L. Campana,G. Capon,Vitaliano Chiarella, P. Laurelli,G. P. Mannocchi,Fabrizio Murtas,G. P. Murtas,L. Passalacqua,M. Pepe Altarelli,M. Chalmers,John F. Kennedy,James G R Lynch,Peter J. Negus,Val O'Shea,B. Raeven,D. J. Smith,P. Teixeira-Dias,A. Stan Thompson,Richard Cavanaugh,S. Dhamotharan,Chr C. Geweniger,Paul A. Hanke,Volker Hepp,E. E. Kluge,G. Leibenguth,Alois Putzer,K. Tittel,Sebastian Werner,Martin Wunsch,R. Beuselinck,David M. Binnie,W. Cameron,Gavin J. Davies,PJ J. Dornan,Maria Girone,Nancy Marinelli,Jeremy Nowell,Helenka Przysiȩzniak,J. K. Sedgbeer,James C. Thompson,Evelyn J. Thomson,Rachel F. White,V. M. Ghete,P. Girtler,Emmerich Kneringer, D. Kuhn,Gerald Rudolph,Chris K. Bowdery,P. G. Buck,D. P. Clarke,Geoffrey F R Ellis,AJ J. Finch,F. Foster,G. D. Hughes,Roger W L Jones,N. A. Robertson,Maria Smižanská,I. Giehl,F. Hölldorfer,Karl Heinz Jakobs,Konrad Kleinknècht,M. Kröcker,Anke Susanne Müller,H. A. Nürnberger,Günter Quast,Burkhard Renk,Eric Rohne,Heinz Georg Sander,S. Schmeling,H. W. Wachsmuth,Ch Zeitnitz,Th Ziegler,Alain Bonissent,John Austin Carr,Paschal A. Coyle,Christian Curtil,Anne Ealet,Dominique Fouchez,Olivier Leroy,Th Kachelhoffer,Patrice Payre,David Rousseau,André Tìlquin,Mario Aleppo,Mario Antonelli,Simone S. Gilardoni,Francesco Ragusa,Hans Dietl,Gerardo Ganis,Kay Hüttmann, G. Lütjens,C. Mannert,W. E. Männer,Hans Günther Moser,Stefan Schael,Ronald Dean Settles,Hasko Stenzel,W. Wiedenmann,Günter K. Wolf,Paolo Azzürri,J. Boucrot,Olivier H. Callot,Michel Davier,L. Duflot,Jean François Grivaz,Ph Heusse,Agnieszka Jachołkowska, L. Serin,J. J. Veillet,Ioana Videau,J. B. De Vivie De Régie,Dirk Zerwas,Giuseppe Bagliesi,Tommaso Boccali,Giovanni Calderini,V. Ciülli,Lorenzo Foà, A. Giassi,F. Ligabue,Alberto Messineo,Fabrizio Palla,Giuliana A. Rizzo,Giulio Sanguinetti,Andrea Sciabà,Giacomo Sgüazzoni,Roberto Tenchini,Andrea Venturi,Piero Giorgio Verdini,Grahame A. Blair,J. Coles,Glen A. Cowan,Martin G. Green,David E. Hutchcroft,Lee T. Jones,T. Medcalf,John A. Strong,J. H. von Wimmersperg-Toeller, R. W. Clifft,T. R. Edgecock,PR R. Norton,I. R. Tomalin,Brigitte Bloch-Devaux,Paul Colas,B. Fabbro,G. Faïf,Eric Lançon,M. C. Lemaire, E. Locci,Patrice Rodríguez Pérez, J. Rander,Jean F. Renardy, A. Rosowsky,P. Seager,Adel Trabelsi,Boris Tuchming,Bertrand Vallage,S. N. Black,J. H. Dann,C. Loomis,H. Y. Kim,Nikos Konstantinidis,Alan M. Litke,M. A. McNeil,Gary N. Taylor,C. N. Booth,Susan L. Cartwright,F. H. Combley,P. N. Hodgson,Mark H. Lehto,Lee F. Thompson,K. Affholderbach,Armin Böhrer,Siegmund Brandt,Claus Grupen,James S. Heß,Andrzej Stanislaw Misiejuk,G. Prange,U. Sieler,C. Borean,Gianrossano R. Giannini,Benigno Gobbo,Hongjian He,J. Putz,Joe E. Rothberg,Steven R. Wasserbaech,S. R. Armstrong,Kyle S. Cranmer,Peter Elmer,D. P S Ferguson,Yongsheng Gao,Sergio González,OJ J. Hayes,Hongbo Hu,Shi Jin,Jennifer E. Kile,PA A. McNamara,Jason Nielsen,W. Orejudos,Yi Pan,Y. Saadi,I. J. Scott,John J. Walsh,Joz Wu,Wu Sau Lan,Xin Wu,Georg Zobernig

PHYSICS LETTERS B（2000）

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摘要

The production of W+W- pairs is analysed in a data sample collected by ALEPH at a mean centre-of-mass energy of 188.6 GeV, corresponding to an integrated luminosity of 174.2 pb(-1). Cross sections are given for different topologies of W decays into leptons or hadrons. Combining all final states and assuming Standard Model branching fractions, the total W-pail cross section is measured to be 15.71 +/- 0.34(stat.) +/- 0.18(syst.) pb. Using also the W-pair data samples collected by ALEPH at lower centre-of-mass energies, the decay branching fraction of the W boson into hadrons is measured to be B(W --> hadrons) = 66.97 +/- 0.65(stat.) +/- 0.32(syst.)%, allowing a determination of the CKM matrix element /V-cs/ = 0.951 +/- 0.030(stat,) +/- 0.015(syst.). (C) 2000 Elsevier Science B.V. All rights reserved.

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