Measurement of the W mass in e+e− collisions at production threshold

Measurement of the W mass in e+e− collisions at production threshold

R. Barate,D. Buskulic,D. Decamp,P. Ghez,C. Goy,J.-P. Lees,Arnaud Lucotte,M.-N. Minard,J.-Y. Nief,B. Pietrzyk,M.P. Casado,Mokhtar Chmeissani,P. Comas,J.M. Crespo,Manuel Delfino,E. Fernandez,M. Fernandez-Bosman,Ll. Garrido,Aurelio Juste,M. Martinez,Ramon Miquel,Ll.M. Mir,S. Orteu,Cristobal Padilla,I.C. Park,A. Pascual,J.A. Perlas,I. Riu,F. Sanchez,F. Teubert,Anna Colaleo,D. Creanza,M. De Palma,G. Gelao,G. Iaselli,G. Maggi,M. Maggi,N. Marinelli,S. Nuzzo,A. Ranieri,Giuseppe Raso,F. Ruggieri,G. Selvaggi,L. Silvestris,P. Tempesta,Alessia Rita Tricomi,G. Zito,X. Huang,J. Lin,Q. Ouyang,T. Wang,Y. Xie,R. Xu,S. Xue,J. Zhang,L. Zhang,W. Zhao,D. Abbaneo,R. Alemany,A.O. Bazarko,U. Becker,P. Bright-Thomas,Marco Cattaneo,F. Cerutti,H. Drevermann,R.W. Forty,M. Frank,R. Hagelberg,J. Harvey,P. Janot,B. Jost,E. Kneringer,J. Knobloch,I. Lehraus,G. Lutters,P. Mato,A. Minten,L. Moneta,A. Pacheco,J.-F. Pusztaszeri,F. Ranjard,P. Rensing,Giuliana Rizzo,Luigi (Gigi) Rolandi,D. Schlatter,M. Schmitt,Olivier Schneider,W. Tejessy,I.R. Tomalin,H. Wachsmuth,A. Wagner,Z. Ajaltouni,A. Barrès,C. Boyer,A. Falvard,C. Ferdi,P. Gay,C. Guicheney,P. Henrard,J. Jousset,B. Michel,S. Monteil,J-C. Montret,D. Pallin,P. Perret,F. Podlyski,J. Proriol,P. Rosnet,J.-M. Rossignol,T. Fearnley,J.B. Hansen,Peter Henrik Hansen,B.S. Nilsson,B. Rensch,A. Wäänänen,G. Daskalakis,A. Kyriakis,C. Markou,E. Simopoulou,A. Vayaki,A. Blondel,J.C. Brient,F. Machefert,A. Rougé,M. Rumpf,A. Valassi,H. Videau,E. Focardi,G. Parrini,K. Zachariadou,M. Corden,C. Georgiopoulos,D.E. Jaffe,A. Antonelli,G. Bencivenni,G. Bologna,F. Bossi,P. Campana,G. Capon,D. Casper,Vitaliano Chiarella,G. Felici,P. Laurelli,G. Mannocchi,F. Murtas,G.P. Murtas,L. Passalacqua,M. Pepe-Altarelli,L. Curtis,S.J. Dorris,A.W. Halley,I.G. Knowles,J.G. Lynch,V. O'Shea,C. Raine,J.M. Scarr,K. Smith,P. Teixeira-Dias,A.S. Thompson,Evelyn Thomson,R.M. Turnbull,C. Geweniger,G. Graefe,P. Hanke,G. Hansper,V. Hepp,E.E. Kluge,A. Putzer,J. Sommer,K. Tittel,S. Werner,M. Wunsch,Raymond Beuselinck,D.M. Binnie,W. Cameron,P.J. Dornan,M. Girone,S. Goodsir,E.B. Martin,P. Morawitz,A. Moutoussi,Jordan Nash,J.K. Sedgbeer,A.M. Stacey,M.D. Williams,G. Dissertori,V.M. Ghete,P. Girtler,D. Kuhn,G. Rudolph,A.P. Betteridge,C.K. Bowdery,P. Colrain,G. Crawford,Alexander Finch,F. Foster,G. Hughes,Roger Jones,T. Sloan,E.P. Whelan,C. Hoffmann,K. Jakobs,K. Kleinknecht,G. Quast,B. Renk,E. Rohne,H.-G. Sander,P. Van Gemmeren,C. Zeitnitz,J.J. Aubert,C. Benchouk,A. Bonissent,G. Bujosa,D. Calvet,J. Carr,P. Coyle,C. Diaconu,Nikolaos Konstantinidis,O. Leroy,F. Motsch,P. Payre,D. Rousseau,M. Talby,A. Sadouki,M. Thulasidas,A. Tilquin,A. Trabelsi,M. Aleppo,F. Ragusa,R. Berlich,W. Blum,V. Büscher,H. Dietl,F. Dydak,G. Ganis,C. Gotzhein,H. Kroha,G. Lütjens,G. Lutz,W. Männer,H.-G. Moser,R. Richter,A. Rosado-Schlosser,S. Schael,R. Settles,H. Seywerd,R. St. Denis,H. Stenzel,Werner Wiedenmann,G. Wolf,J. Boucrot,O. Callot,S. Chen,A. Cordier,M. Davier,L. Duflot,Jean-François Grivaz,Ph. Heusse,A. Höcker,A. Jacholkowska,M. Jacquet,D.W. Kim,F. Le Diberder,J. Lefrançois,A.-M. Lutz,I. Nikolic,M.-H. Schune,S. Simion,E. Tournefier,J.-J. Veillet,I. Videau,D. Zerwas,P. Azzurri,G. Bagliesi,G. Batignani,S. Bettarini,C. Bozzi,G. Calderini,M. Carpinelli,Maria Agnese Ciocci,V. Ciulli,R. Dell'Orso,R. Fantechi,Isidoro Ferrante,A. Giassi,A. Gregorio,Franco Ligabue,A. Lusiani,Pier Simone Marrocchesi,A. Messineo,F. Palla,G. Sanguinetti,A. Sciabà,Paolo Spagnolo,J. Steinberger,R. Tenchini,Guido Emilio Tonelli,C. Vannini,A. Venturi,P.G. Verdini,G.A. Blair,L.M. Bryant,J.T. Chambers,Y. Gao,M.G. Green,T. Medcalf,P. Perrodo,J.A. Strong,J.H. Von Wimmersperg-Toeller,D.R. Botterill,R.W. Clifft,T.R. Edgecock,S. Haywood,P. Maley,P.R. Norton,J.C. Thompson,A.E. Wright,Brigitte Bloch-Devaux,P. Colas,B. Fabbro,W. Kozanecki,E. Lançon,M.C. Lemaire,E. Locci,P. Perez,J. Rander,J.-F. Renardy,A. Rosowsky,A. Roussarie,J.-P. Schuller,J. Schwindling,B. Vallage,S.N. Black,J.H. Dann,H.Y. Kim,Alan Litke,M.A. McNeil,G. Taylor,C.N. Booth,R. Boswell,C.A.J. Brew,S. Cartwright,F. Combley,M.S. Kelly,M. Lehto,W.M. Newton,J. Reeve,L.F. Thompson,K. Affholderbach,A. Böhrer,S. Brandt,G. Cowan,J. Foss,C. Grupen,P. Saraiva,L. Smolik,F. Stephan,M. Apollonio,L. Bosisio,R. Della Marina,G. Giannini,B. Gobbo,G. Musolino,J. Putz,J. Rothberg,S. Wasserbaech,R.W. Williams,S.R. Armstrong,E. Charles,P. Elmer,D.P.S. Ferguson,S. González,T.C. Greening,O.J. Hayes,H. Hu,S. Jin,P.A. McNamara,J.M. Nachtman,Jason Nielsen,W. Orejudos,Y.B. Pan,Y. Saadi,I.J. Scott,J. Walsh,Sau Lan Wu,X. Wu,J.M. Yamartino,G. Zobernig;R. Barate;D. Buskulic;D. Decamp;P. Ghez;C. Goy;J.-P. Lees;Arnaud Lucotte;M.-N. Minard;J.-Y. Nief;B. Pietrzyk;M.P. Casado;Mokhtar Chmeissani;P. Comas;J.M. Crespo;Manuel Delfino;E. Fernandez;M. Fernandez-Bosman;Ll. Garrido;Aurelio Juste;M. Martinez;Ramon Miquel;Ll.M. Mir;S. Orteu;Cristobal Padilla;I.C. Park;A. Pascual;J.A. Perlas;I. Riu;F. Sanchez;F. Teubert;Anna Colaleo;D. Creanza;M. De Palma;G. Gelao;G. Iaselli;G. Maggi;M. Maggi;N. Marinelli;S. Nuzzo;A. Ranieri;Giuseppe Raso;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;Alessia Rita Tricomi;G. Zito;X. Huang;J. Lin;Q. Ouyang;T. Wang;Y. Xie;R. Xu;S. Xue;J. Zhang;L. Zhang;W. Zhao;D. Abbaneo;R. Alemany;A.O. Bazarko;U. Becker;P. Bright-Thomas;Marco Cattaneo;F. Cerutti;H. Drevermann;R.W. Forty;M. Frank;R. Hagelberg;J. Harvey;P. Janot;B. Jost;E. Kneringer;J. Knobloch;I. Lehraus;G. Lutters;P. Mato;A. Minten;L. Moneta;A. Pacheco;J.-F. Pusztaszeri;F. Ranjard;P. Rensing;Giuliana Rizzo;Luigi (Gigi) Rolandi;D. Schlatter;M. Schmitt;Olivier Schneider;W. Tejessy;I.R. Tomalin;H. Wachsmuth;A. Wagner;Z. Ajaltouni;A. Barrès;C. Boyer;A. Falvard;C. Ferdi;P. Gay;C. Guicheney;P. Henrard;J. Jousset;B. Michel;S. Monteil;J-C. Montret;D. Pallin;P. Perret;F. Podlyski;J. Proriol;P. Rosnet;J.-M. Rossignol;T. Fearnley;J.B. Hansen;Peter Henrik Hansen;B.S. Nilsson;B. Rensch;A. Wäänänen;G. Daskalakis;A. Kyriakis;C. Markou;E. Simopoulou;A. Vayaki;A. Blondel;J.C. Brient;F. Machefert;A. Rougé;M. Rumpf;A. Valassi;H. Videau;E. Focardi;G. Parrini;K. Zachariadou;M. Corden;C. Georgiopoulos;D.E. Jaffe;A. Antonelli;G. Bencivenni;G. Bologna;F. Bossi;P. Campana;G. Capon;D. Casper;Vitaliano Chiarella;G. Felici;P. Laurelli;G. Mannocchi;F. Murtas;G.P. Murtas;L. Passalacqua;M. Pepe-Altarelli;L. Curtis;S.J. Dorris;A.W. Halley;I.G. Knowles;J.G. Lynch;V. O'Shea;C. Raine;J.M. Scarr;K. Smith;P. Teixeira-Dias;A.S. Thompson;Evelyn Thomson;R.M. Turnbull;C. Geweniger;G. Graefe;P. Hanke;G. Hansper;V. Hepp;E.E. Kluge;A. Putzer;J. Sommer;K. Tittel;S. Werner;M. Wunsch;Raymond Beuselinck;D.M. Binnie;W. Cameron;P.J. Dornan;M. Girone;S. Goodsir;E.B. Martin;P. Morawitz;A. Moutoussi;Jordan Nash;J.K. Sedgbeer;A.M. Stacey;M.D. Williams;G. Dissertori;V.M. Ghete;P. Girtler;D. Kuhn;G. Rudolph;A.P. Betteridge;C.K. Bowdery;P. Colrain;G. Crawford;Alexander Finch;F. Foster;G. Hughes;Roger Jones;T. Sloan;E.P. Whelan;C. Hoffmann;K. Jakobs;K. Kleinknecht;G. Quast;B. Renk;E. Rohne;H.-G. Sander;P. Van Gemmeren;C. Zeitnitz;J.J. Aubert;C. Benchouk;A. Bonissent;G. Bujosa;D. Calvet;J. Carr;P. Coyle;C. Diaconu;Nikolaos Konstantinidis;O. Leroy;F. Motsch;P. Payre;D. Rousseau;M. Talby;A. Sadouki;M. Thulasidas;A. Tilquin;A. Trabelsi;M. Aleppo;F. Ragusa;R. Berlich;W. Blum;V. Büscher;H. Dietl;F. Dydak;G. Ganis;C. Gotzhein;H. Kroha;G. Lütjens;G. Lutz;W. Männer;H.-G. Moser;R. Richter;A. Rosado-Schlosser;S. Schael;R. Settles;H. Seywerd;R. St. Denis;H. Stenzel;Werner Wiedenmann;G. Wolf;J. Boucrot;O. Callot;S. Chen;A. Cordier;M. Davier;L. Duflot;Jean-François Grivaz;Ph. Heusse;A. Höcker;A. Jacholkowska;M. Jacquet;D.W. Kim;F. Le Diberder;J. Lefrançois;A.-M. Lutz;I. Nikolic;M.-H. Schune;S. Simion;E. Tournefier;J.-J. Veillet;I. Videau;D. Zerwas;P. Azzurri;G. Bagliesi;G. Batignani;S. Bettarini;C. Bozzi;G. Calderini;M. Carpinelli;Maria Agnese Ciocci;V. Ciulli;R. Dell'Orso;R. Fantechi;Isidoro Ferrante;A. Giassi;A. Gregorio;Franco Ligabue;A. Lusiani;Pier Simone Marrocchesi;A. Messineo;F. Palla;G. Sanguinetti;A. Sciabà;Paolo Spagnolo;J. Steinberger;R. Tenchini;Guido Emilio Tonelli;C. Vannini;A. Venturi;P.G. Verdini;G.A. Blair;L.M. Bryant;J.T. Chambers;Y. Gao;M.G. Green;T. Medcalf;P. Perrodo;J.A. Strong;J.H. Von Wimmersperg-Toeller;D.R. Botterill;R.W. Clifft;T.R. Edgecock;S. Haywood;P. Maley;P.R. Norton;J.C. Thompson;A.E. Wright;Brigitte Bloch-Devaux;P. Colas;B. Fabbro;W. Kozanecki;E. Lançon;M.C. Lemaire;E. Locci;P. Perez;J. Rander;J.-F. Renardy;A. Rosowsky;A. Roussarie;J.-P. Schuller;J. Schwindling;B. Vallage;S.N. Black;J.H. Dann;H.Y. Kim;Alan Litke;M.A. McNeil;G. Taylor;C.N. Booth;R. Boswell;C.A.J. Brew;S. Cartwright;F. Combley;M.S. Kelly;M. Lehto;W.M. Newton;J. Reeve;L.F. Thompson;K. Affholderbach;A. Böhrer;S. Brandt;G. Cowan;J. Foss;C. Grupen;P. Saraiva;L. Smolik;F. Stephan;M. Apollonio;L. Bosisio;R. Della Marina;G. Giannini;B. Gobbo;G. Musolino;J. Putz;J. Rothberg;S. Wasserbaech;R.W. Williams;S.R. Armstrong;E. Charles;P. Elmer;D.P.S. Ferguson;S. González;T.C. Greening;O.J. Hayes;H. Hu;S. Jin;P.A. McNamara;J.M. Nachtman;Jason Nielsen;W. Orejudos;Y.B. Pan;Y. Saadi;I.J. Scott;J. Walsh;Sau Lan Wu;X. Wu;J.M. Yamartino;G. Zobernig;
physics letters b 1997 Vol. 401 pp. 347-362
184
zobernig1997physicsmeasurement

Abstract

In June 1996, the LEP centre-of-mass energy was raised to 161 GeV. Pair production of W bosons in e+e− collisions was observed for the first time by the LEP experiments. An integrated luminosity of 11 pb−1 was recorded in the ALEPH detector, in which WW candidate events were observed. In 6 events both Ws decay leptonically. In 16 events, one W decays leptonically, the other into hadrons. In the channel where both Ws decay into hadrons, a signal was separated from the large background by means of several multi-variate analyses. The W pair cross-section is measured to be σWW = 4.23 ± 0.73 (stat.) ± 0.19 (syst.) pb. From this cross-section, the W mass is derived within the framework of the Standard Model: mW = 80.14 ± 0.34 (stat.) ± 0.09 (syst.) ± 0.03 (LEP energy) GeV/c2

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