The production of W+W- pairs is analysed in a data sample collected by ALEPH at a mean centre-of-mass energy of 182.7 GeV, corresponding to an integrated luminosity of 57 pb(-1). Cross sections are given for different topologies of W decays into leptons or hadrons. Under Standard Model assumptions for the W-pair production and decay, the W-pair cross section is measured to be 15.57 +/- 0.62 (stat.) +/- 0.29 (syst.) ph. Using also the W-pair data samples collected by ALEPH at lower centre-of-mass energies, the decay branching ratio of the W boson into hadrons is measured to be B(W --> hadrons) = 68.93 +/- 1.21 (stat.) +/- 0.51 (syst.)%, allowing a determination of the CKM matrix element /V-cs/ = 1.043 +/- 0.058 (stat.) +/- 0.026 (syst.). The agreement of the cross sections with the Standard Model prediction allows a limit to be set on the W decay rate to undetectable final states.
Measurement of W-pair production in e(+)e(-) collisions at 183 GeV / R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, J. Lees, F. Martin, E. Merle, M. Minard, B. Pietrzyk, R. Alemany, M. Casado, M. Chmeissani, J. Crespo, E. Fernandez, M. Fernandez-Bosman, L. Garrido, E. Grauges, A. Juste, M. Martinez, G. Merino, R. Miquel, L. Mir, P. Morawitz, A. Pacheco, I. Park, I. Riu, A. Colaleo, D. Creanza, M. de Palma, G. Gelao, 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, U. Becker, G. Boix, M. Cattaneo, V. Ciulli, G. Dissertori, H. Drevermann, R. Forty, M. Frank, F. Gianotti, A. Halley, J. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, O. Leroy, C. Loomis, P. Maley, P. Mato, A. Minten, A. Moutoussi, F. Ranjard, L. Rolandi, D. Rousseau, D. Schlatter, M. Schmitt, O. Schneider, W. Tejessy, F. Teubert, I. Tomalin, E. Tournefier, M. Vreeswijk, A. Wright, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, S. Dessagne, A. Falvard, C. Ferdi, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. Montret, D. Pallin, P. Perret, F. Podlyski, J. Hansen, J. Hansen, P. Hansen, B. Nilsson, B. Rensch, A. Waananen, G. Daskalakis, A. Kyriakis, C. Markou, E. Simopoulou, A. Vayaki, A. Blondel, J. Brient, F. Machefert, A. Rouge, M. Swynghedauw, R. Tanaka, A. Valassi, H. Videau, E. Focardi, G. Parrini, K. Zachariadou, R. Cavanaugh, M. Corden, C. Georgiopoulos, A. Antonelli, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, F. Cerutti, V. Chiarella, P. Laurelli, G. Mannocchi, F. Murtas, G. Murtas, L. Passalacqua, M. Pepe-Altarelli, M. Chalmers, L. Curtis, J. Lynch, P. Negus, V. O'Shea, B. Raeven, C. Raine, D. Smith, P. Teixeira-Dias, A. Thompson, J. Ward, O. Buchmuller, S. Dhamotharan, C. Geweniger, P. Hanke, G. Hansper, V. Hepp, E. Kluge, A. Putzer, J. Sommer, K. Tittel, S. Werner, M. Wunsch, R. Beuselinck, D. Binnie, W. Cameron, P. Dornan, M. Girone, S. Goodsir, N. Marinelli, E. Martin, J. Nash, J. Nowell, A. Sciaba, J. Sedgbeer, P. Spagnolo, E. Thomson, M. Williams, V. Ghete, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph, A. Betteridge, C. Bowdery, P. Buck, P. Colrain, G. Crawford, G. Ellis, A. Finch, F. Foster, G. Hughes, R. Jones, N. Robertson, M. Williams, P. van Gemmeren, I. Giehl, F. Holldorfer, C. Hoffmann, K. Jakobs, K. Kleinknecht, M. Krocker, H. Nurnberger, G. Quast, B. Renk, E. Rohne, H. Sander, S. Schmeling, H. Wachsmuth, C. Zeitnitz, T. Ziegler, J. Aubert, C. Benchouk, A. Bonissent, J. Carr, P. Coyle, A. Ealet, D. Fouchez, F. Motsch, P. Payre, M. Talby, M. Thulasidas, A. Tilquin, M.R.A. Aleppo, M. Antonelli, F. Ragusa, R. Berlich, V. Buscher, H. Dietl, G. Ganis, K. Huttmann, G. Lutjens, C. Mannert, W. Manner, H. Moser, S. Schael, R. Settles, H. Seywerd, H. Stenzel, W. Wiedenmann, G. Wolf, P. Azzurri, J. Boucrot, O. Callot, S. Chen, M. Davier, L. Duflot, J. Grivaz, P. Heusse, A. Jacholkowska, M. Kado, J. Lefranois, L. Serin, J. Veillet, I. Videau, J. de Regie, D. Zerwas, G. Bagliesi, S. Bettarini, T. Boccali, C. Bozzi, G. Calderini, R. Dell'Orso, I. Ferrante, A. Giassi, A. Gregorio, F. Ligabue, A. Lusiani, P. Marrocchesi, A. Messineo, F. Palla, G. Rizzo, G. Sanguinetti, G. Sguazzoni, R. Tenchini, C. Vannini, A. Venturi, P. Verdini, G. Blair, J. Coles, G. Cowan, M. Green, D. Hutchcroft, L. Jones, T. Medcalf, J. Strong, J. von Wimmersperg-Toeller, D. Botterill, R. Clifft, T. Edgecock, P. Norton, J. Thompson, B. Bloch-Devaux, P. Colas, B. Fabbro, G. Faif, E. Lancon, M. Lemaire, E. Locci, P. Perez, H. Przysiezniak, J. Rander, J. Renardy, A. Rosowsky, A. Trabelsi, B. Tuchming, B. Vallage, S. Black, J. Dann, H. Kim, N. Konstantinidis, A. Litke, M. McNeil, G. Taylor, C. Booth, S. Cartwright, F. Combley, P. Hodgson, M. Kelly, M. Lehto, L. Thompson, K. Affholderbach, A. Bohrer, S. Brandt, C. Grupen, A. Misiejuk, G. Prange, U. Sieler, G. Giannini, B. Gobbo, J. Putz, J. Rothberg, S. Wasserbaech, R. Williams, S. Armstrong, E. Charles, P. Elmer, D. Ferguson, Y. Gao, S. Gonzalez, T. Greening, O. Hayes, H. Hu, S. Jin, P. McNamara, J. Nachtman, J. Nielsen, W. Orejudos, Y. Pan, Y. Saadi, I. Scott, J. Walsh, S. Wu, X. Wu, G. Zobernig. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 453:1/2(1999), pp. 107-120.
Measurement of W-pair production in e(+)e(-) collisions at 183 GeV
M.R.A. Aleppo;F. Ragusa;
1999
Abstract
The production of W+W- pairs is analysed in a data sample collected by ALEPH at a mean centre-of-mass energy of 182.7 GeV, corresponding to an integrated luminosity of 57 pb(-1). Cross sections are given for different topologies of W decays into leptons or hadrons. Under Standard Model assumptions for the W-pair production and decay, the W-pair cross section is measured to be 15.57 +/- 0.62 (stat.) +/- 0.29 (syst.) ph. Using also the W-pair data samples collected by ALEPH at lower centre-of-mass energies, the decay branching ratio of the W boson into hadrons is measured to be B(W --> hadrons) = 68.93 +/- 1.21 (stat.) +/- 0.51 (syst.)%, allowing a determination of the CKM matrix element /V-cs/ = 1.043 +/- 0.058 (stat.) +/- 0.026 (syst.). The agreement of the cross sections with the Standard Model prediction allows a limit to be set on the W decay rate to undetectable final states.Pubblicazioni consigliate
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