Measurement of the W mass by direct reconstruction in e+e- collisions at 172 GeV

R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, S. Jezequel, J. P. Lees, A. Lucotte, M. N. Minard, J. Y. Nief, B. Pietrzyk, G. Boix, M. P. Casado, M. Chmeissani, J. M. Crespo, M. Delfino, E. Fernandez, M. Fernandez-Bosman, L. Garrido, E. GraugesA. Juste, M. Martinez, G. Merino, R. Miquel, Ll M. Mir, P. Morawitz, I. C. Park, A. Pascual, J. A. Perlas, I. Riu, F. Sanchez, 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, R. Alemany, U. Becker, P. Bright-Thomas, D. Casper, M. Cattaneo, F. Cerutti, V. Ciulli, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, F. Gianotti, R. Hagelberg, J. B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, P. Mato, A. Minten, L. Moneta, A. Pacheco, J. F. Pusztaszeri, F. Ranjard, L. Rolandi, D. Rousseau, D. Schlatter, M. Schmitt, O. Schneider, W. Tejessy, F. Teubert, I. R. Tomalin, M. Vreeswijk, H. Wachsmuth, A. Wagner, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, A. Falvard, C. Ferdi, P. Gay

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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 10.65 pb-1 collected with the ALEPH detector at a mean centre-of-mass energy of 172.09 GeV. The invariant mass distribution of simulated events are fitted to the experimental distributions and the following W masses are obtained: WW → qq̄qq̄, mW = 81.30 ± 0.47(stat.) ± 0.11(syst.) GeV/c2, WW →ℓvqq̄(ℓ= e,μ), mW = 80.54 ± 0.47(stat.) ± 0.11(syst.) GeV/c2, WW → τvqq̄, mW = 79.56 ± 1.08(stat.) ± 0.23(syst.) GeV/c2. The statistical errors are the expected errors for Monte Carlo samples of the same integrated luminosity as the data. The combination of these three measurements gives: mW = 80.80 ± 0.32(stat.) ± 0.11(syst.) ± 0.03(LEP energy) GeV/c2. © 1998 Elsevier Science B.V.
Original languageEnglish
Pages (from-to)384-398
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 12 Mar 1998


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