Measurements of mass, width and gauge couplings of the W boson at LEP L3 collaboration

M. Acciarri, O. Adriani, M. Aguilar-Benitez, S. Ahlen, J. Alcaraz, G. Alemanni, J. Allaby, A. Aloisio, G. Alverson, M. G. Alviggi, G. Ambrosi, H. Anderhub, V. P. Andreev, T. Angelescu, F. Anselmo, A. Arefiev, T. Azemoon, T. Aziz, P. Bagnaia, L. BaksayS. Banerjee, Sw Banerjee, K. Banicz, A. Barczyk, R. Barillère, L. Barone, P. Bartalini, A. Baschirotto, M. Basile, R. Battiston, A. Bay, F. Becattini, U. Becker, F. Behner, J. Berdugo, P. Berges, B. Bertucci, B. L. Betev, S. Bhattacharya, M. Biasini, A. Biland, G. M. Bilei, J. J. Blaising, S. C. Blyth, G. J. Bobbink, R. Bock, A. Böhrn, L. Boldizsar, B. Borgia, D. Bourilkov, M. Bourquin, S. Braccini, J. G. Branson, V. Brigljevic, I. C. Brock, A. Buffini, A. Buijs, J. D. Burger, W. J. Burger, J. Busenitz, A. Button, X. D. Cai, M. Campanelli, M. Capell, G. Cara Romeo, G. Carlino, A. M. Cartacci, J. Casaus, G. Castellini, F. Cavallari, N. Cavallo, C. Cecchi, M. Cerrada, F. Cesaroni, M. Chamizo, Y. H. Chang, U. K. Chaturvedi, S. V. Chekanov, M. Chemarin, A. Chen, G. Chen, G. M. Chen, H. F. Chen, H. S. Chen, X. Chereau, G. Chiefari, C. Y. Chien, L. Cifarelli, F. Cindolo, C. Civinini, I. Clare, R. Clare, H. O. Cohn, G. Coignet, A. P. Colijn, N. Colino, V. Commichau, S. Costantini, F. Cotorobai

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Abstract

We report on measurements of mass and total decay width of the W boson and of triple-gauge-boson couplings, γWW and ZWW, with the L3 detector at LEP. W-pair events produced in e+e- interactions between 161GeV and 172GeV centre-of-mass energy are selected in a data sample corresponding to a total luminosity of 21.2 pb-1. The mass and total decay width of the W boson are determined to be Mw = 80.75+0.26 -0.27 (exp.) ± 0.03 (LEP) GeV and Γw = 1.74 +0.88 -0.78 (stat.) ± 0.25 (syst.) GeV, respectively. Limits on anomalous triple-gauge-boson couplings, γWW and ZWW, are determined, in particular - 1.5 < δz < 1.9 (95% CL), excluding vanishing ZWW coupling at more than 95% confidence level.

Original languageEnglish
Pages (from-to)176-190
Number of pages15
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume413
Issue number1-2
DOIs
StatePublished - 6 Nov 1997

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