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

R. Barate 1 D. Decamp 1 P. Ghez 1 C. Goy 1 S. Jezequel 1 J P. Lees 1 F. Martin 1 E. Merle 1 M N. Minard 1 B. Pietrzyk 1 R. Alemany S. Bravo M P. Casado M. Chmeissani J M. Crespo E. Fernandez M. Fernandez-Bosman L. Garrido E. Graughs M. Martmnez G. Merino R. Miquel L M. Mir A. Pacheco H. Ruiz A. Colaleo D. Creanza 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 Jiali Lin Q. Ouyang T. Wang Y. Xie R. Xu S. Xue J. Zhang L. Zhang W. Zhao D. Abbaneo G. Boix M. Cattaneo F. Cerutti G. Dissertori H. Drevermann R W. Forty M. Frank F. Gianotti T C. Greening a W. Halley J B. Hansen J. Harvey P. Janot B. Jost M. Kado V. Lemantre P. Maley P. Mato A. Minten A. Moutoussi F. Ranjard L. Rolandi D. Schlatter M. Schmitt O. Schneider P. Spagnolo W. Tejessy F. Teubert E. Tournefier A. Valassi J J. Ward a E. Wright Ziad Ajaltouni 2 F. Badaud 2 G. Chazelle 2 O. Deschamps 2 S. Dessagne 2 Alain Falvard 2 Pascal Gay 2 C. Guicheney 2 Pierre Henrard 2 J. Jousset 2 B. Michel 2 S. Monteil 2 Jean-Claude Montret 2 D. Pallin 2 J M. Pascolo 2 Pascal Perret 2 F. Podlyski 2 J D. Hansen J R. Hansen P H. Hansen B S. Nilsson A. Wddndnen G. Daskalakis A. Kyriakis C. Markou E. Simopoulou A. Vayaki A. Blondel 3 J C. Brient 3 F. Machefert 3 A. Rougi M. Swynghedauw 3 R. Tanaka 3 H. Videau 3 E. Focardi G. Parrini K. Zachariadou A. Antonelli G. Bencivenni G. Bologna F. Bossi P. Campana G. Capon V. Chiarella P. Laurelli G. Mannocchi F. Murtas G P. Murtas L. Passalacqua M. Pepi-Altarelli M. Chalmers J. Kennedy J G. Lynch P. Negus V. O'Shea B. Rdven D. Smith P. Teixeira-Dias a S. Thompson R. Cavanaugh S. Dhamotharan C. Geweniger P. Hanke V. Hepp E E. Kluge G. Leibenguth A. Putzer K. Tittel E. Wannemacher S. Werner M. Wunsch R. Beuselinck D M. Binnie W. Cameron G. Davies P J. Dornan M. Girone N. Marinelli J. Nowell H. Przysiezniak J K. Sedgbeer J C. Thompson E. Thomson R. White V M. Ghete P. Girtler E. Kneringer D. Kuhn G. Rudolph C K. Bowdery P G. Buck D P. Clarke G. Ellis a J. Finch F. Foster G. Hughes R W L. Jones N A. Robertson M. Smizanska I. Giehl F. Hvlldorfer K. Jakobs K. Kleinknecht M. Krvcker G. Quast B. Renk E. Rohne H G. Sander S. Schmeling H. Wachsmuth C. Zeitnitz T. Ziegler A. Bonissent 4 J. Carr 4 P. Coyle 4 C. Curtil 4 A. Ealet 4 D. Fouchez 4 O. Leroy 4 T. Kachelhoffer 4 P. Payre 4 D. Rousseau 4 A. Tilquin 4 M. Aleppo M. Antonelli S. Gilardoni F. Ragusa H. Dietl G. Ganis C. Mannert W. Mdnner H G. Moser S. Schael R. Settles H. Stenzel W. Wiedenmann G. Wolf P. Azzurri 5 J. Boucrot 5 O. Callot 5 M. Davier 5 L. Duflot 5 J F. Grivaz 5 P. Heusse 5 A. Jacholkowska 5 L. Serin 5 J J. Veillet 5 I. Videau 5 J B. de Vivie de Rigie 5 D. Zerwas 5 G. Bagliesi T. Boccali G. Calderini V. Ciulli A. Giassi F. Ligabue A. Messineo F. Palla G. Rizzo G. Sanguinetti G. Sguazzoni R. Tenchini A. Venturi P G. Verdini G A. Blair J. Coles G. Cowan M G. Green D E. Hutchcroft L T. Jones T. Medcalf J A. Strong R W. Clifft T R. Edgecock P R. Norton I R. Tomalin B. Bloch-Devaux P. Colas D. Boumediene B. Fabbro G. Faof E. Langon M C. Lemaire E. Locci P. Pirez J. Rander J F. Renardy A. Rosowsky P. Seager A. Trabelsi B. Tuchming B. Vallage S N. Black J H. Dann C. Loomis H Y. Kim N. Konstantinidis a M. Litke M A. Mcneil G. Taylor C N. Booth S. Cartwright F. Combley P N. Hodgson M. Lehto L F. Thompson K. Affholderbach A. Bvhrer S. Brandt C. Grupen J. Hess A. Misiejuk G. Prange U. Sieler C. Borean G. Giannini B. Gobbo H. He J. Putz J E. Rothberg S. Wasserbaech S R. Armstrong K. Cranmer P. Elmer D P S. Ferguson Y. Gao S. Gonzalez O J. Hayes H. Hu S. Jin J. Kile P A. Mcnamara J. Nielsen W. Orejudos y B. Pan Y. Saadi I J. Scott J. Walsh J H. von Wimmersperg-Toeller J. Wu S L. Wu X. Wu G. Zobernig
Abstract : The mass of the W boson is determined in e+e- collisions at LEP by the direct reconstruction of W decays in WW->qqqq and WW->lvqq events, supplemented by measurements using the kinematic properties of the leptons in the WW->lvlv decay channel. The main sample of W pairs is selected from an integrated luminosity of 174 pb^-1 collected with the ALEPH detector in 1998 at a centre-of-mass energy of 188.63 GeV.The combined result from all channels is mW = 80.432+-0.072(stat.)+-0.041(syst.)+-0.019(FSI)+-0.017(LEP) GeV/c^2, where FSI represents the possible effects of final state interactions in the qqqq channel. In a second two-parameter fit to the qqqq, evqq and mvqq channels, where the W mass and width are decoupled, the average W width is found to be 2.24+-0.20(stat.)+-0.13(syst.) GeV/c^2, consistent with the Standard Model prediction. The combination of the mass measurement presented in this paper together with those derived previously from the W pair cross section at 161 and 172 GeV and direct reconstruction at 172 and 183 GeV gives mW = 80.418+-0.061(stat.)+-0.038(syst.)+-0.019(FSI)+-0.017(LEP) GeV
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R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, et al.. Measurement of the W Mass and Width in $e^+ e^-$ Collisions at 189 GeV. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2000, 17, pp.241-261. ⟨in2p3-00005329⟩

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