Measurement of W-pair cross sections in e+e- interactions at √s = 172 GeV and W-decay branching fractions

M. Acciarri,O. Adriani,M. Aguilar-Benitez,S. Ahlen,J. Alcaraz,G. Alemanni,J. Allaby,A. Aloisio,G. Alverson,M. G. Alviggi,G. Ambrosi,H. Anderhub,V.P. Andreev,T. Angelescu,F. Anselmo,A. Arefiev,T. Azemoon,Tariq Aziz,P. Bagnaia,L. Baksay,S Banerjee,Sw. Banerjee,K. Banicz,A. Barczyk,R. Barillère,Luciano Barone,P Bartalini,A. Baschirotto,M. Basile,R. Battiston,A. Bay,F. Becattini,U. Becker,F. Behner,J. Berdugo,P. Berges,B. Bertucci,B.L. Betev,S. Bhattacharya,M. Biasini,A. Biland,G. M. Bilei,J.J. Blaising,S.C. Blyth,Gerjan Bobbink,R. Bock,A. Böhm,Laszlo Boldizsar,B. Borgia,D. Bourilkov,M. Bourquin,S. Braccini,J. G. Branson,V. Brigljevic,I. Brock,A. Buffini,A. Buijs,J.D. Burger,W.J. Burger,J. Busenitz,A. Button,X. D. Cai,M. Campanelli,M. Capell,G. Cara Romeo,G. Carlino,A.M. Cartacci,J. Casaus,G. Castellini,F. Cavallari,N. Cavallo,C Cecchi,M. Cerrada,F. Cesaroni,M. Chamizo,Y. H. Chang,U.K. Chaturvedi,S. Chekanov,M. Chemarin,A. Chen,G. Chen,G.M. Chen,H.F. Chen,H.S. Chen,X. Chereau,G. Chiefari,C.Y. Chien,L. Cifarelli,F. Cindolo,Carlo Civinini,I. Clare,R. Clare,H.O. Cohn,G. Coignet,A. P. Colijn,N. Colino,V. Commichau,S. Costantini,F. Cotorobai,B. De La Cruz,A. Csilling,T. S. Dai,Raffaello DAlessandro,R. de Asmundis,A. Degré,K. Deiters,D. della Volpe,P. Denes,F. DeNotaristefani,D. DiBitonto,M. Diemoz,D. van Dierendonck,F. Di Lodovico,C. Dionisi,M. Dittmar,A. Dominguez,A. Doria,M. T. Dova,D. Duchesneau,P. Duinker,I. Durán,S. Dutta,S. Easo,Yu. Efremenko,H. El Mamouni,A. Engler,F.J. Eppling,F.C. Erné,J.-P. Ernenwein,P. Extermann,M. Fabre,R. Faccini,S. Falciano,A. Favara,J. Fay,O. L. Fedin,Marta Felcini,B. Fenyi,T. Ferguson,F. Ferroni,H. Fesefeldt,E. Fiandrini,J.H. Field,F. Filthaut,Peter H. Fisher,I. Fisk,G. Forconi,L. Fredj,K. Freudenreich,C. Furetta,Yu. Galaktionov,S.N. Ganguli,P. Garcia Abia,S.S. Gau,S. Gentile,N. Gheordanescu,S. Giagu,S. Goldfarb,J. Goldstein,Z.F. Gong,A. Gougas,G. Gratta,M.W. Gruenewald,V.K. Gupta,A. Gurtu,L. Gutay,B. Hartmann,A. Hasan,D Hatzifotiadou,T. Hebbeker,A. Hervé,W.C. van Hoek,H. Hofer,S.J. Hong,H Hoorani,S.R. Hou,G. Hu,V. Innocente,K. Jenkes,B.N. Jin,L. W. Jones,P. de Jong,I. Josa-Mutuberria,A. Kasser,R.A. Khan,D. Kamrad,Yu. Kamyshkov,J.S. Kapustinsky,Y. Karyotakis,M. Kaur,M.N. Kienzle-Focacci,D. Kim,D Kim,J.K. Kim,S.C. Kim,Y.G. Kim,W.W. Kinnison,A. Kirkby,D. Kirkby,J. Kirkby,D. Kiss,W. Kittel,A. Klimentov,A. C. König,A Kopp,I. Korolko,V. Koutsenko,R.W. Kraemer,W. Krenz,A. Kunin,P. Ladron de Guevara,I. Laktineh,G. Landi,C. Lapoint,K. Lassila-Perini,P. Laurikainen,M. Lebeau,A. Lebedev,P. Lebrun,P. Lecomte,Paul Lecoq,P. Le Coultre,J.M. Le Goff,R. Leiste,E. Leonardi,P. Levtchenko,C Li,Ch Lin,W.T. Lin,F. Linde,L Lista,Z.A. Liu,W. Lohmann,E. Longo,W. Lu,Y.S. Lu,K. Lübelsmeyer,C. Luci,D. Luckey,L. Luminari,W. Lustermann,W.G. Ma,M. Maity,G. Majumder,L. Malgeri,A. Malinin,C. Maña,D. Mangeol,S. Mangla,P. Marchesini,A. Marin,J.-P. Martin,F. Marzano,G. Massaro,D McNally,R.R. McNeil,S. Mele,L. Merola,M. Meschini,W.J. Metzger,M. von der Mey,Y. Mi,A Mihul,A.J.W. van Mil,G. Mirabelli,J. Mnich,P. Molnar,B. Monteleoni,R. Moore,S. Morganti,T. Moulik,R. Mount,S. Müller,F. Muheim,A.J.M. Muijs,S. Nahn,M. Napolitano,F. Nessi-Tedaldi,Harvey B Newman,T. Niessen,A. Nippe,A. Nisati,H. Nowak,Y.D. Oh,H. Opitz,Giovanni Organtini,R. Ostonen,C. Palomares,D. Pandoulas,S. Paoletti,P. Paolucci,H.K. Park,I.H. Park,G. Pascale,G. Passaleva,S. Patricelli,T. Paul,M. Pauluzzi,C. Paus,F. Pauss,D. Peach,Y.J. Pei,S. Pensotti,D. Perret-Gallix,B. Petersen,S. Petrak,A. Pevsner,Davide Piccolo,M. Pieri,J.C. Pinto,P. Piroué,E. Pistolesi,V. Plyaskin,M. Pohl,V. Pojidaev,H. Postema,N. Produit,D. Prokofiev,G. Rahal-Callot,N. Raja,P.G. Rancoita,M. Rattaggi,G. Raven,Panos A Razis,K. Read,D. Ren,M. Rescigno,S. Reucroft,T. van Rhee,S. Riemann,K. Riles,A. Robohm,J. Rodin,B.P. Roe,Luciano Romero,S. Rosier-Lees,Ph. Rosselet,W. van Rossum,S. Roth,J.A. Rubio,D. Ruschmeier,H. Rykaczewski,J. Salicio,E. Sanchez,M. P. Sanders,M.E. Sarakinos,Subir Sarkar,M. Sassowsky,C. Schäfer,V. A. Schegelsky,S. Schmidt-Kaerst,D. Schmitz,P. Schmitz,N. Scholz,H. Schopper,D.J. Schotanus,J. Schwenke,G. Schwering,C. Sciacca,D. Sciarrino,L. Servoli,S. Shevchenko,N. Shivarov,V. Shoutko,J. Shukla,E. Shumilov,A. Shvorob,T. Siedenburg,D. C. Son,S. Sopczak,B. Smith,P. Spillantini,M. Steuer,David Stickland,A. Stone,H. Stone,B. Stoyanov,A. Straessner,Konstantin Strauch,K. Sudhakar,G. Sultanov,L.Z. Sun,Gf Susinno,H. Suter,J.D. Swain,X.W. Tang,L. Tauscher,L. Taylor,Samuel C.C. Ting,S. M. Ting,M. Tonutti,S.C. Tonwar,J. Tóth,C. Tully,H. Tuchscherer,K.L. Tung,Y. Uchida,J. Ulbricht,U. Uwer,E. Valente,R.T. Van de Walle,G. Vesztergombi,I. Vetlitsky,G. Viertel,M. Vivargent,R. Völkert,H. Vogel,H. Vogt,I. Vorobiev,A. A. Vorobyov,A. Vorvolakos,M. Wadhwa,W. Wallraff,J.C. Wang,X.L. Wang,Z.M. Wang,A. Weber,F. Wittgenstein,S.X. Wu,S. Wynhoff,J. Xu,Z.Z. Xu,B.Z. Yang,C.G. Yang,X.Y. Yao,J.B. Ye,S.C. Yeh,J.M. You,An. Zalite,Yu. Zalite,P. Zemp,Y. Zeng,Z.P. Zhang,Zhiqing Zhang,Bing Zhou,G.Y. Zhu,R. Y. Zhu,A. Zichichi,F. Ziegler

Measurement of W-pair cross sections in e+e- interactions at √s = 172 GeV and W-decay branching fractions

1997

Abstract We report on the measurement of W-boson pair-production with the L3 detector at LEP at an average centre-of-mass energy of 172.13 GeV. In a data sample corresponding to a total luminosity of 10.25 pb −1 we select 110 four-fermion events with pairs of hadronic jets or leptons with high invariant masses. Branching fractions of W decays into different fermion-antifermion pairs are determined with and without the assumption of charged-current lepton universality. The branching fraction for hadronic W decays is measured to be: B (W → hadrons) = 64.2 −3.8 +3.7 (stat.) ± 0.5 (syst.) %. Combining all final states the total cross section for W-pair production is measured to be: σ WW = 12.27 −1.32 +1.41 (stat.) ± 0.23 (syst.) pb. The results are in good agreement with the Standard Model.

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