Measurement of the Mass and Width of the W Boson in e+e- Collisions at 189 GeV

Giovanni Abbiendi,K. Ackerstaff,C. Ainsley,P. F. Åkesson,G. Alexander,J. Allison,K. J. Anderson,S. Arcelli,S. Asai,S. F. Ashby,D. Axen,Georges Azuelos,I. Bailey,A. H. Ball,E. Barberio,R. J. Barlow,S. Baumann,T. Behnke,K. W. Bell,G. Bella,A. Bellerive,G. Benelli,S. Bentvelsen,S. Bethke,O. Biebel,I. J. Bloodworth,O. Boeriu,P. Bock,J. Böhme,D. Bonacorsi,M. Boutemeur,S. Braibant,P. Bright-Thomas,L. Brigliadori,R. M. Brown,H. Burckhart,J. Cammin,P. Capiluppi,R. K. Carnegie,A. A. Carter,J. R. Carter,C. Y. Chang,David G. Charlton,P. E. L. Clarke,E. Clay,I. Cohen,O. C. Cooke,J. Couchman,C. Couyoumtzelis,R. L. Coxe,A Csilling,M. Cuffiani,S. Dado,Gaetano-Marco Dallavalle,S. Dallison,A. De Roeck,E. A. De Wolf,P. Dervan,Klaus Kurt Desch,B. Dienes,M. S. Dixit,M. Donkers,J. Dubbert,Ehud Duchovni,G. Duckeck,I. P. Duerdoth,P. G. Estabrooks,E. Etzion,Fabrizio Fabbri,M. Fanti,L. Feld,P. Ferrari,F. Fiedler,Ivor Fleck,M. Ford,A. Frey,A. Fürtjes,D. Futyan,P. Gagnon,J. W. Gary,G. Gaycken,C. Geich-Gimbel,G. Giacomelli,Paolo Giacomelli,D. Glenzinski,J. Goldberg,C. Grandi,K. Graham,E. Gross,J. Grunhaus,M. Gruwé,P. O. Günther,C. Hajdu,G. G. Hanson,M. Hansroul,M. Hapke,K. Harder,Amnon Harel,M. Harin-Dirac,A. Hauke,M. Hauschild,C. M. Hawkes,R. Hawkings,R.J. Hemingway,C. Hensel,G. Herten,R.-D. Heuer,J. C. Hill,A. Hocker,K. Hoffman,R. J. Homer,A. K. Honma,D. Horvath,K. R. Hossain,R. Howard,P. Hüntemeyer,P. Igo-Kemenes,K. Ishii,F. R. Jacob,A. Jawahery,H. Jeremie,C. R. Jones,P Jovanovic,T. R. Junk,N. Kanaya,J. Kanzaki,G. Karapetian,D. Karlen,V. Kartvelishvili,K. Kawagoe,T. Kawamoto,Richard Keeler,R. G. Kellogg,B. W. Kennedy,D. H. Kim,K. Klein,A. Klier,Stefan Kluth,T. Kobayashi,Michael Kobel,T. P. Kokott,Sachio Komamiya,R. Kowalewski,T. Kress,P. Krieger,J. von Krogh,Thorsten Kuhl,M. Kupper,P. Kyberd,G. D. Lafferty,H. Landsman,D. Lanske,I. Lawson,J. G. Layter,A. Leins,D. Lellouch,J. Letts,Lorne Levinson,R. Liebisch,J. Lillich,B. List,C. Littlewood,A. W. Lloyd,S. L. Lloyd,F. K. Loebinger,G. D. Long,M. J. Losty,J. Lu,J. Ludwig,A. Macchiolo,A. Macpherson,Wolfgang Mader,S. Marcellini,T. E. Marchant,A.J. Martin,J.P. Martin,G. Martinez,T. Mashimo,P. Mättig,W. J. McDonald,J. McKenna,T. J. McMahon,Robert McPherson,F. Meijers,P. Mendez-Lorenzo,W. Menges,F. S. Merritt,H. Mes,A. Michelini,S. Mihara,G. Mikenberg,D. J. Miller,W. Mohr,A. Montanari,T. Mori,K. Nagai,I. Nakamura,H.A. Neal,R. Nisius,S.W. O'Neale,F. G. Oakham,F. Odorici,H. Ogren,A. Oh,A. Okpara,M. J. Oreglia,S. Orito,G Pásztor,J. R. Pater,G. N. Patrick,J. Patt,P. Pfeifenschneider,J. E. Pilcher,J. Pinfold,D. E. Plane,B. Poli,J. Polok,O. Pooth,Mariusz Przybycien,A. Quadt,C. Rembser,P. Renkel,H. Rick,N. Rodning,J. M. Roney,S. Rosati,K. Roscoe,A. M. Rossi,Y. Rozen,K. Runge,O. Runolfsson,D. R. Rust,K. Sachs,T. Saeki,O. Sahr,E. K.G. Sarkisyan,C. Sbarra,A. D. Schaile,O. Schaile,P. Scharff-Hansen,M. Schröder,Markus Schumacher,Christoph Schwick,W. G. Scott,R. Seuster,T. Shears,B. C. Shen,C. H. Shepherd-Themistocleous,P. Sherwood,G. P. Siroli,A. Skuja,A. Smith,G. A. Snow,Randall Sobie,S. Söldner-Rembold,S. Spagnolo,M. Sproston,A. Stahl,K. Stephens,K. Stoll,David Strom,R. Ströhmer,L. Stumpf,B. Surrow,S. D. Talbot,S. Tarem,Richard Taylor,Richard Teuscher,M. Thiergen,J. Thomas,M. Thomson,E. Torrence,S. Towers,D. Toya,T. Trefzger,Isabel Marian Trigger,Zoltan Laszlo Trocsanyi,E. Tsur,M. F. Turner-Watson,I Ueda,B. Vachon,P. Vannerem,M Verzocchi,H. Voss,J. H. Vossebeld,D. Waller,C.P. Ward,D.R. Ward,P. M. Watkins,A. T. Watson,N. K. Watson,P. S. Wells,T. Wengler,N. Wermes,D. Wetterling,J. S. White,G. W. Wilson,J. A. Wilson,T. R. Wyatt,S. Yamashita,V. Zacek,D. Zer-Zion

Measurement of the Mass and Width of the W Boson in e+e- Collisions at 189 GeV

2001

The mass and width of the W boson are determined in e+e− collisions at LEP using 183 pb−1 of data recorded at a centre-of-mass energy √s = 189 GeV with the OPAL detector. The invariant mass distributions from 970 W+W−→qqqq and 1118 W+W−→qqlνl candidate events are used to measure the mass of the W boson, MW=80.451±0.076 (stat.)±0.049 (syst.) GeV. A direct measurement of the width of the W boson gives ΓW=2.09±0.18 (stat.)±0.09 (syst.) GeV. The results are combined with previous OPAL results from 78 pb−1 of data recorded with √s from 161 to 183 GeV, to obtain: MW=80.432±0.066 (stat.)±0.045 (syst.) GeV, ΓW=2.04±0.16 (stat.)±0.09 (syst.) GeV. The consistency of the direct measurement of MW with that inferred from other measurements of electroweak parameters provides an important test of the Standard Model of electroweak interactions.

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