Measurement of triple gauge-boson couplings at LEP energies up to 189 GeV

A. Heister, S. Schael, R. Barate, I. de Bonis, D. Decamp, P. Ghez, C. Goy, S. Jezequel, J. P. Lees, F. Martin, E. Merle, M. N. Minard, B. Pietrzyk, B. Trocmé, S. Bravo, M. P. Casado, M. Chmeissani, J. M. Crespo, E. Fernandez, M. Fernandez-BosmanL. Garrido, E. Graugés, J. Lopez, M. Martinez, G. Merino, R. Miquel, L. M. Mir, A. Pacheco, D. Paneque, H. Ruiz, A. Colaleo, D. Creanza, N. De Filippis, 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, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, P. Azzurri, T. Barklow, G. Boix, O. Buchmüller, M. Cattaneo, F. Cerutti, B. Clerbaux, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, F. Gianotti, T. C. Greening, J. B. Hansen, J. Harvey, D. E. Hutchcroft, P. Janot, B. Jost, M. Kado, V. Lemaitre, P. Maley, P. Mato, A. Moutoussi, F. Ranjard, L. Rolandi, D. Schlatter, P. Spagnolo, W. Tejessy, F. Teubert, E. Tournefier, A. Valassi, J. J. Ward, A. E. Wright, Z. Ajaltouni, F. Badaud, S. Dessagne, A. Falvard, D. Fayolle, P. Gay, P. Henrard, J. Jousset, B. Michel, S. Monteil

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32 Citations (Scopus)


The triple gauge-boson couplings involving the W are determined using data samples collected with the ALEPH detector at mean centre-of-mass energies of 183GeV and 189GeV, corresponding to integrated luminosities of 57 pb-1 and 174, pb-1, respectively. The couplings, gZ1, and λγ, are measured using W-pair events, single-W production and single-γ production. Each coupling is measured individually with the other two couplings fixed at their standard model value. Including ALEPH results from lower energies, the 95% confidence level intervals for the deviation to the standard model are -0.087 < ΔgZ1 < 0.141, -0.200 < ΔKγ < 0.258, and - 0.062 < λγ < 0.147. Fits are also presented where two or all three couplings are allowed to vary. In addition, W-pair events are used to set limits on the C-or P-violating couplings gV4, gV5, K̃V, and λV, where V denotes either γ or Z. No deviations from the standard model expectations are observed.
Original languageEnglish
Pages (from-to)423-441
JournalEuropean Physical Journal C
Issue number3
Publication statusPublished - 1 Jan 2001


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