Measurement of the W boson mass and width in e + e - collisions at LEP

S. Schael,R. Barate, R. Brunelière,I. De Bonis,D. Decamp,C. Goy,S. Jézéquel,J.-P. Lees,F. Martin,E. Merle,M.-N. Minard,B. Pietrzyk,B. Trocmé,S. Bravo,M.P. Casado,M. Chmeissani,J.M. Crespo,E. Fernandez,M. Fernandez-Bosman,L. Garrido,M. Martinez,A. Pacheco,H. Ruiz,A. Colaleo,D. Creanza,N. De Filippis,M. de Palma, G. Iaselli,G. Maggi,M. Maggi,S. Nuzzo,A. Ranieri,G. Raso,F. Ruggieri,G. Selvaggi,L. Silvestris,P. Tempesta,A. 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,T. Barklow,O. Buchmüller,M. Cattaneo,B. Clerbaux,H. Drevermann,R.W. Forty,M. Frank,F. Gianotti,J.B. Hansen,J. Harvey,D.E. Hutchcroft,P. Janot,B. Jost, M. Kado,P. Mato,A. Moutoussi,F. Ranjard,L. Rolandi,D. Schlatter,F. Teubert,A. Valassi,I. Videau,F. Badaud,S. Dessagne,A. Falvard,D. Fayolle,P. Gay,J. Jousset,B. Michel,S. Monteil,D. Pallin,J.M. Pascolo,P. Perret,J.D. Hansen,J.R. Hansen,P.H. Hansen,A.C. Kraan,B.S. Nilsson,A. Kyriakis,C. Markou,E. Simopoulou,A. Vayaki,K. Zachariadou,A. Blondel,J.-C. Brient,F. Machefert,A. Rougé,H. Videau,V. Ciulli,E. Focardi, G. Parrini,A. Antonelli, M. Antonelli, G. Bencivenni,F. Bossi,G. Capon,F. Cerutti,V. Chiarella, P. Laurelli, G. Mannocchi, G.P. Murtas,L. Passalacqua,J. Kennedy, J.G. Lynch, P. Negus,V. O’Shea, A.S. Thompson, S. Wasserbaech,R. Cavanaugh, S. Dhamotharan, C. Geweniger, P. Hanke, V. Hepp, E.E. Kluge, A. Putzer, H. Stenzel, K. Tittel, M. Wunsch,R. Beuselinck,W. Cameron,G. Davies,P.J. Dornan,M. Girone, N. Marinelli, J. Nowell, S.A. Rutherford, J.K. Sedgbeer,J.C. Thompson,R. White, V.M. Ghete, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph, E. Bouhova-Thacker, C.K. Bowdery, D.P. Clarke,G. Ellis,A.J. Finch, F. Foster, G. Hughes,R.W.L. Jones, M.R. Pearson, N.A. Robertson, T. Sloan, M. Smizanska, O. van der Aa,C. Delaere, G. Leibenguth,V. Lemaitre, U. Blumenschein, F. Hölldorfer, K. Jakobs, F. Kayser, A.-S. Müller, B. Renk,H.-G. Sander,S. Schmeling,H. Wachsmuth, C. Zeitnitz,T. Ziegler, A. Bonissent,P. Coyle, C. Curtil, A. Ealet, D. Fouchez, P. Payre,A. Tilquin,F. Ragusa,A. David,H. Dietl, G. Ganis, K. Hüttmann, G. Lütjens, W. Männer, H.-G. Moser,R. Settles,M. Villegas,G. Wolf,J. Boucrot, O. Callot, M. Davier, L. Duflot,J.-F. Grivaz, P. Heusse, A. Jacholkowska, L. Serin, J.-J. Veillet,P. Azzurri,G. Bagliesi,T. Boccali, L. Foà,A. Giammanco, A. Giassi,F. Ligabue, A. Messineo,F. Palla,G. Sanguinetti, A. Sciabà,G. Sguazzoni,P. Spagnolo, R. Tenchini,A. Venturi, P.G. Verdini,O. Awunor, G.A. Blair, G. Cowan, A. Garcia-Bellido,M.G. Green, T. Medcalf, A. Misiejuk,J.A. Strong, P. Teixeira-Dias, R.W. Clifft,T.R. Edgecock,P.R. Norton, I.R. Tomalin, J.J. Ward,B. Bloch-Devaux,D. Boumediene,P. Colas, B. Fabbro,E. Lançon,M.-C. Lemaire, E. Locci, P. Perez, J. Rander,A. Trabelsi, B. Tuchming, B. Vallage,A.M. Litke,G. Taylor,C.N. Booth,S. Cartwright, F. Combley, P.N. Hodgson,M. Lehto,L.F. Thompson,A. Böhrer,S. Brandt, C. Grupen,J. Hess, A. Ngac, G. Prange, C. Borean,G. Giannini,H. He,J. Putz, J. Rothberg,S.R. Armstrong,K. Berkelman,K. Cranmer, D.P.S. Ferguson, Y. Gao,S. González,O.J. Hayes,H. Hu,S. Jin, J. Kile,P.A. McNamara III,J. Nielsen, Y.B. Pan,J.H. von Wimmersperg-Toeller,W. Wiedenmann,J. Wu,Sau Lan Wu,X. Wu, G. Zobernig,G. Dissertori

EUROPEAN PHYSICAL JOURNAL C(2006)

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摘要
The mass of the W boson is determined from the direct reconstruction of W decays in WW→qq̄qq̄ and WW→ℓνqq̄ events in e + e - collisions at LEP. The data sample corresponds to an integrated luminosity of 683 pb -1 collected with the ALEPH detector at centre-of-mass energies up to 209 GeV. To minimise any effect from colour reconnection a new procedure is adopted in which low energy particles are not considered in the mass determination from the qq̄qq̄ channel. The combined result from all channels is m_W=80.440 ±0.043(stat.)±0.024(syst.)±0.009(FSI)±0.009(LEP)GeV/c^2, where FSI represents the possible effects of final state interactions in the qq̄qq̄ channel and LEP indicates the uncertainty in the beam energy. From two-parameter fits to the W mass and width, the W width is found to be Γ_W = 2.14 ±0.09(stat.)±0.04(syst.)±0.05(FSI)±0.01(LEP)GeV.
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