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Measurement of the W mass in $e^+ e^-$ collisions at 183 GeV

By R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, J.P. Lees, F. Martin, E. Merle, M.N. Minard, B. Pietrzyk, R. Alemany, M P. Casado, M. Chmeissani, J M. Crespo, E. Fernandez, M. Fernandez-Bosman, L. Garrido, E. Graughs, A. Juste, M. Martmnez, G. Merino, R. Miquel, L M. Mir, P. Morawitz, A. Pacheco, I C. 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, Jiali 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 W. Forty, M. Frank, F. Gianotti, A W. Halley, J B. 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 R. Tomalin, E. Tournefier, M. Vreeswijk, Ziad Ajaltouni, F. Badaud, O. Deschamps, S. Dessagne, Alain Falvard, C. Ferdi, Pascal Gay, C. Guicheney, Pierre Henrard, J. Jousset, B. Michel, S. Monteil, Jean-Claude Montret, D. Pallin, Pascal Perret, F. Podlyski, J D. Hansen, J R. Hansen, P H. Hansen, B S. Nilsson, B. Rensch, A. Wddndnen, G. Daskalakis, C. Markou, E. Simopoulou, A. Vayaki, A. Blondel, J C. 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 P. Murtas, L. Passalacqua, M. Pepi-Altarelli, M. Chalmers, L. Curtis, G. LynchJ, P. Negus, V. O'Shea, B. Raeven, C. Raine, D. Smith, P. Teixeira-Dias, A S. Thompson, J J. Ward, S. Dhamotharan, C. Geweniger, P. Hanke, G. Hansper, V. Hepp, E E. Kluge, A L. Onk, A. Putzer, G. Schmidt, J. Sommer, K. Tittel, S. Werner, M. Wunsch, R. Beuselinck, D M. Binnie, W. Cameron, P J. Dornan, M. Girone, S. Goodsir, N. Marinelli, E B. Martin, J. Nash, J. Nowell, J K. Sedgbeer, P. Spagnolo, E. Thomson, M D. Williams, V M. Ghete, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph, A P. Betteridge, C K. Bowdery, P G. Buck, P. Colrain, G. Crawford, G. Ellis, A J. Finch, F. Foster, G. Hughes, R WL. Jones, N A. Robertson, M. Williams, P. Van Gemmeren, I. Giehl, F. Hvlldorfer, C. Hoffmann, K. Jakobs, K. Kleinknecht, M. Krvcker, G. Quast, B. Renk, E. Rohne, H G. Sander, S. Schmeling, H. Wachsmuth, C. Zeitnitz, T. Ziegler, J.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. Aleppo, M. Antonelli, F. Ragusa, R. Berlich, H. Dietl, G. Ganis, C. Mannert, W. Mdnner, H G. Moser, R. Settles, H. Seywerd, H. Stenzel, W. Wiedenmann, G. Wolf, J. Boucrot, O. Callot, S. Chen, M. Davier, L. Duflot, J F. Grivaz, P. Heusse, A. Jacholkowska, M. Kado, W. KimD, J. Lefrangois, L. Serin, J J. Veillet, I. Videau, J B. De Vivie De Rigie, D. Zerwas, P. Azzurri, G. Bagliesi, S. Bettarini, T. Boccali, C. Bozzi, G. Calderini, R. Dell'Orso, G. D'Onofrio, R. Fantechi, I. Ferrante, A. Giassi, A. Gregorio, F. Ligabue, A. Lusiani, P S. Marrocchesi, A. Messineo, F. Palla, G. Rizzo, G. Sanguinetti, G. Sguazzoni, R. Tenchini, C. Vannini, A. Venturi, P G. Verdini, G A. Blair, J T. Chambers, J. Coles, G. Cowan, M G. Green, D E. Hutchcroft, L T. Jones, T. Medcalf, J A. Strong, J H. VonWimmersperg-Toeller, D R. Botterill, R W. Clifft, T R. Edgecock, P R. Norton, J C. Thompson, A E. Wright, B. Bloch-Devaux, P. Colas, B. Fabbro, G. Faof, E. Langon, M C. Lemaire, E. Locci, P. Pirez, H. Przysiezniak, J. Rander, J F. Renardy, A. Rosowsky, A. Trabelsi, B. Tuchming, B. Vallage, S N. Black, J H. Dann, H Y. Kim, N. Konstantinidis, A M. Litke, M A. McNeil, G. Taylor, C N. Booth, S L. Cartwright, F. Combley, PN. Hodgson, M S. Kelly, M H. Lehto, L F. Thompson, K. Affholderbach, A. Bvhrer, S. Brandt, J. Foss, C. Grupen, A. Misiejuk, G. Prange, U. Sieler, L. Smolik, F. Stephan, G. Giannini, J. Putz, J E. Rothberg, S. Wasserbaech, R W. Williams, S R. Armstrong, E. Charles, P. Elmer, D P S. Ferguson, Y. Gao, S. Gonzalez, T C. Greening, O J. Hayes, H. Hu, S. Jin, G. Mamier, P A. McNamara, J M. Nachtman, J. Nielsen, W. Orejudos, Y B. Pan, Y. Saadi, I J. Scott, M. Vogt, J. Walsh, S L. Wu, X. Wu and G. Zobernig

Abstract

The mass of the W boson is obtained from reconstructed invariant mass distributions in W-pair events. The sample of W pairs is selected from 57 pb$^{-1}$ collected with the ALEPH detector in 1997 at a centre-of-mass energy of 183 GeV. The invariant mass distributions of reweighted Monte Carlo events are fitted separately to the experimental distributions in the $qqbarqqbar$ and all $l\nuqqbar$ channels to give the following W masses: $m_{W}^{hadronic} = 80.461 \pm 0.177(stat.) \pm 0.045(syst.) \pm 0.056(theory) GeV/c^2$, $m_{W}^{semileptonic} = 80.326 \pm 0.184(stat.) \pm 0.040(syst.) GeV/c^2$ where the theory error represents the possible effects of final state interactions. The combination of these two measurements, including the LEP energy calibration uncertainty, gives $m_{W} = 80.393 \pm 0.128(stat.)\pm 0.041(syst.) \pm 0.028(theory)\pm 0.021(LEP) GeV/c^2

Topics: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: 'Elsevier BV'
Year: 1999
OAI identifier: oai:HAL:in2p3-00011569v1

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