Measurement of the cross section of W-boson pair production at LEP

• DOI: 10.1016/j.physletb.2004.08.060
• Publication Date: 2004-09-10T13:22:03Z
• Authors: P. Achard; O. Adriani; M. Aguilar-Benitez; J. Alcaraz; G. Alemanni; J. Allaby; A. Aloisio; M.G. Alviggi; H. Anderhub; V.P. Andreev; F. Anselmo; A. Arefiev; T. Azemoon; T. Aziz; P. Bagnaia; A. Bajo; G. Baksay; L. Baksay; S.V. Baldew; S. Banerjee; Sw. Banerjee; A. Barczyk; R. Barillère; P. Bartalini; M. Basile; N. Batalova; R. Battiston; A. Bay; F. Becattini; U. Becker; F. Behner; L. Bellucci; R. Berbeco; J. Berdugo; P. Berges; B. Bertucci; B.L. Betev; M. Biasini; M. Biglietti; A. Biland; J.J. Blaising; S.C. Blyth; G.J. Bobbink; A. Böhm; L. Boldizsar; B. Borgia; S. Bottai; D. Bourilkov; M. Bourquin; S. Braccini; J.G. Branson; F. Brochu; J.D. Burger; W.J. Burger; A. Button; X.D. Cai; M. Capell; G. Cara Romeo; G. Carlino; A. Cartacci; J. Casaus; F. Cavallari; N. Cavallo; C. Cecchi; M. Cerrada; M. Chamizo; Y.H. Chang; M. Chemarin; A. Chen; G. Chen; G.M. Chen; H.F. Chen; H.S. Chen; G. Chiefari; L. Cifarelli; F. Cindolo; I. Clare; R. Clare; G. Coignet; N. Colino; S. Costantini; B. de la Cruz; S. Cucciarelli; J.A. van Dalen; R. de Asmundis; P. Déglon; J. Debreczeni; A. Degré; K. Dehmelt; K. Deiters; D. della Volpe; E. Delmeire; P. Denes; F. DeNotaristefani; A. De Salvo; M. Diemoz; M. Dierckxsens; D. van Dierendonck; C. Dionisi; M. Dittmar; A. Doria; M.T. Dova; D. Duchesneau; M. Duda; B. Echenard; A. Eline; A. El Hage; H. El Mamouni; A. Engler; F.J. Eppling; P. Extermann; M.A. Falagan; S. Falciano; A. Favara; J. Fay; O. Fedin; M. Felcini; T. Ferguson; H. Fesefeldt; E. Fiandrini; J.H. Field; F. Filthaut; P.H. Fisher; W. Fisher; I. Fisk; G. Forconi; K. Freudenreich; C. Furetta; Yu. Galaktionov; S.N. Ganguli; P. Garcia-Abia; M. Gataullin; S. Gentile; S. Giagu; Z.F. Gong; G. Grenier; O. Grimm; M.W. Gruenewald; M. Guida; V.K. Gupta; A. Gurtu; L.J. Gutay; D. Haas; D. Hatzifotiadou; T. Hebbeker; A. Hervé; J. Hirschfelder; H. Hofer; M. Hohlmann; G. Holzner; S.R. Hou; Y. Hu; B.N. Jin; L.W. Jones; P. de Jong; I. Josa-Mutuberría; M. Kaur; M.N. Kienzle-Focacci; J.K. Kim; J. Kirkby; W. Kittel; A. Klimentov; A.C. König; M. Kopal; V. Koutsenko; M. Kräber; R.W. Kraemer; A. Krüger; A. Kunin; P. Ladron de Guevara; I. Laktineh; G. Landi; M. Lebeau; A. Lebedev; P. Lebrun; P. Lecomte; P. Lecoq; P. Le Coultre; J.M. Le Goff; R. Leiste; M. Levtchenko; P. Levtchenko; C. Li; S. Likhoded; C.H. Lin; W.T. Lin; F.L. Linde; L. Lista; Z.A. Liu; W. Lohmann; E. Longo; Y.S. Lu; C. Luci; L. Luminari; W. Lustermann; W.G. Ma; L. Malgeri; A. Malinin; C. Maña; J. Mans; J.P. Martin; F. Marzano; K. Mazumdar; R.R. McNeil; S. Mele; L. Merola; M. Meschini; W.J. Metzger; A. Mihul; H. Milcent; G. Mirabelli; J. Mnich; G.B. Mohanty; T. Moulik; G.S. Muanza; A.J.M. Muijs; B. Musicar; M. Musy; S. Nagy; R. Nandakumar; S. Natale; M. Napolitano; F. Nessi-Tedaldi; H. Newman; A. Nisati; T. Novak; H. Nowak; R. Ofierzynski; G. Organtini; I. Pal; C. Palomares; P. Paolucci; R. Paramatti; G. Passaleva; S. Patricelli; T. Paul; M. Pauluzzi; C. Paus; F. Pauss; M. Pedace; S. Pensotti; D. Perret-Gallix; B. Petersen; D. Piccolo; F. Pierella; M. Pioppi; P.A. Piroué; E. Pistolesi; V. Plyaskin; M. Pohl; V. Pojidaev; J. Pothier; D. Prokofiev; J. Quartieri; G. Rahal-Callot; M.A. Rahaman; P. Raics; N. Raja; R. Ramelli; P.G. Rancoita; R. Ranieri; A. Raspereza; P. Razis; D. Ren; M. Rescigno; S. Reucroft; S. Riemann; K. Riles; B.P. Roe; L. Romero; A. Rosca; C. Rosemann; C. Rosenbleck; S. Rosier-Lees; S. Roth; J.A. Rubio; G. Ruggiero; H. Rykaczewski; A. Sakharov; S. Saremi; S. Sarkar; J. Salicio; E. Sanchez; C. Schäfer; V. Schegelsky; H. Schopper; D.J. Schotanus; C. Sciacca; L. Servoli; S. Shevchenko; N. Shivarov; V. Shoutko; E. Shumilov; A. Shvorob; D. Son; C. Souga; P. Spillantini; M. Steuer; D.P. Stickland; B. Stoyanov; A. Straessner; K. Sudhakar; G. Sultanov; L.Z. Sun; S. Sushkov; H. Suter; J.D. Swain; Z. Szillasi; X.W. Tang; P. Tarjan; L. Tauscher; L. Taylor; B. Tellili; D. Teyssier; C. Timmermans; Samuel C.C. Ting; S.M. Ting; S.C. Tonwar; J. Tóth; C. Tully; K.L. Tung; J. Ulbricht; E. Valente; R.T. Van de Walle; R. Vasquez; V. Veszpremi; G. Vesztergombi; I. Vetlitsky; D. Vicinanza; G. Viertel; S. Villa; M. Vivargent; S. Vlachos; I. Vodopianov; H. Vogel; H. Vogt; I. Vorobiev; A.A. Vorobyov; M. Wadhwa; Q. Wang; X.L. Wang; Z.M. Wang; A. Weber; M. Weber; H. Wilkens; S. Wynhoff; L. Xia; Z.Z. Xu; J. Yamamoto; B.Z. Yang; C.G. Yang; H.J. Yang; M. Yang; S.C. Yeh; An. Zalite; Yu. Zalite; Z.P. Zhang; J. Zhao; G.Y. Zhu; R.Y. Zhu; H.L. Zhuang; A. Zichichi; B. Zimmermann; M. Zöller
• Keywords: Nuclear and High Energy Physics; radiative-corrections;; positron electron --> W+ W-; FOS: Physical sciences; ddc:500.2; electron positron: annihilation; W: leptonic decay; W --> lepton neutrino; 530; 01 natural sciences; 7. Clean energy; info:eu-repo/classification/ddc/500.2; High Energy Physics - Experiment; W: pair production; High Energy Physics - Experiment (hep-ex); decay branching fractions;; Theoretical High Energy Physics; 0103 physical sciences; [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; e(+)e(-) collisions;; high-energy;; W: branching ratio; 189-209 GeV-cms; channel cross section: energy dependence; info:eu-repo/classification/ddc/530; lepton: universality; W: hadronic decay; einstein correlations; carlo event generator;; decay branching fractions;; angle bhabha scattering;; monte-carlo;; e(+)e(-) collisions;; color reconnection;; final-states;; high-energy;; radiative-corrections;; einstein correlations; monte-carlo;; final state: (4fermion); differential cross section: angular dependence; CERN LEP Stor; electron positron: colliding beams; final-states;; color reconnection;; W --> 2quark; L3; Experimental High Energy Physics; electroweak interaction: validity test; angle bhabha scattering;; carlo event generator;; experimental results

The cross section of W-boson pair-production is measured with the L3 detector at LEP. In a data sample corresponding to a total luminosity of 629.4/pb, collected at centre-of-mass energies ranging from 189 to 209 GeV, 9834 four-fermion events with W bosons decaying into hadrons or leptons are selected. The total cross section is measured with a precision of 1.4 % and agrees with the Standard Model expectation. Assuming charged-lepton universality, the branching fraction for hadronic W-boson decays is measured to be: Br(W-->hadrons) = 67.50 +- 0.42 (stat.) +- 0.30(syst.) %, in agreement with the Standard Model. Differential cross sections as a function of the W- production angle are also measured for the semi-leptonic channels qqev and qqmv.