@article{3138604,
    title = "Study of W-boson polarisations and triple gauge boson couplings in the
reaction e(+)e(-)-> W+W- at LEP 2",
    author = "Abdallah, J. and Abreu, P. and Adam, W. and Adzic, P. and Albrecht, T. and and Alemany-Fernandez, R. and Allmendinger, T. and Allport, P. P. and and Amaldi, U. and Amapane, N. and Amato, S. and Anashkin, E. and Andreazza, and A. and Andringa, S. and Anjos, N. and Antilogus, P. and Apel, W. -D. and and Arnoud, Y. and Ask, S. and Asman, B. and Augustin, J. E. and Augustinus, and A. and Baillon, P. and Ballestrero, A. and Bambade, P. and Barbier, R. and and Bardin, D. and Barker, G. J. and Baroncelli, A. and Battaglia, M. and and Baubillier, M. and Becks, K-H. and Begalli, M. and Behrmann, A. and and Ben-Haim, E. and Benekos, N. and Benvenuti, A. and Berat, C. and and Berggren, M. and Bertrand, D. and Besancon, M. and Besson, N. and Bloch, and D. and Blom, M. and Bluj, M. and Bonesini, M. and Boonekamp, M. and and Booth, P. S. L. and Borisov, G. and Botner, O. and Bouquet, B. and and Bowcock, T. J. V. and Boyko, I. and Bracko, M. and Brenner, R. and and Brodet, E. and Bruckman, P. and Brunet, J. M. and Buschbeck, B. and and Buschmann, P. and Calvi, M. and Camporesi, T. and Canale, V. and Carena, and F. and Castro, N. and Cavallo, F. and Chapkin, M. and Charpentier, Ph. and and Checchia, P. and Chierici, R. and Chliapnikov, P. and Chudoba, J. and and Chung, S. U. and Cieslik, K. and Collins, P. and Contri, R. and and Cosme, G. and Cossutti, F. and Costa, M. J. and Crennell, D. and Cuevas, and J. and D'Hondt, J. and da Silva, T. and Da Silva, W. and Della Ricca, G. and and De Angelis, A. and De Boer, W. and De Clercq, C. and De Lotto, B. and and De Maria, N. and De Min, A. and De Paula, L. and Di Ciaccio, L. and and Di Simone, A. and Doroba, K. and Drees, J. and Eigen, G. and Ekelof, T. and and Ellert, M. and Elsing, M. and Santo, M. C. Espirito and Fanourakis, and G. and Fassouliotis, D. and Feindt, M. and Fernandez, J. and Ferrer, A. and and Ferro, F. and Flagmeyer, U. and Foeth, H. and Fokitis, E. and and Fulda-Quenzer, F. and Fuster, J. and Gandelman, M. and Garcia, C. and and Gavillet, Ph. and Gazis, E. and Gokieli, R. and Golob, B. and and Gomez-Ceballos, G. and Goncalves, P. and Graziani, E. and Grosdidier, G. and and Grzelak, K. and Guy, J. and Haag, C. and Hallgren, A. and Hamacher, and K. and Hamilton, K. and Haug, S. and Hauler, F. and Hedberg, V. and and Hennecke, M. and Hoffman, J. . and Holmgren, S-O. and Holt, P. J. and and Houlden, M. A. and Jackson, J. N. and Jarlskog, G. and Jarry, P. and and Jeans, D. and Johansson, E. K. and Jonsson, P. and Joram, C. and and Jungermann, L. and Kapusta, F. and Katsanevas, S. and Katsoufis, E. and and Kernel, G. and Kersevan, B. P. and Kerzel, U. and King, B. T. and Kjaer, and N. J. and Kluit, P. and Kokkinias, P. and Kourkoumelis, C. and and Kouznetsov, O. and Krumstein, Z. and Kucharczyk, M. and Lamsa, J. and and Leder, G. and Ledroit, F. and Leinonen, L. and Leitner, R. and Lemonne, and J. and Lepeltier, V. and Lesiak, T. and Liebig, W. and Liko, D. and and Lipniacka, A. and Lopes, J. H. and Lopez, J. M. and Loukas, D. and Lutz, and P. and Lyons, L. and MacNaughton, J. and Malek, A. and Maltezos, S. and and Mandl, F. and Marco, J. and Marco, R. and Marechal, B. and Margoni, M. and and Marin, J-C. and Mariotti, C. and Markou, A. and Martinez-Rivero, C. and and Masik, J. and Mastroyiannopoulos, N. and Matorras, F. and Matteuzzi, and C. and Mazzucato, F. and Mazzucato, M. and Mc Nulty, R. and Meroni, C. and and Migliore, E. and Mitaroff, W. and Mjoernmark, U. and Moa, T. and and Moch, M. and Moenig, K. and Monge, R. and Montenegro, J. and Moraes, D. and and Moreno, S. and Morettini, P. and Mueller, U. and Muenich, K. and and Mulders, M. and Mundim, L. and Murray, W. and Muryn, B. and Myatt, G. and and Myklebust, T. and Nassiakou, M. and Navarria, F. and Nawrocki, K. and and Nicolaidou, R. and Nikolenko, M. and Oblakowska-Mucha, A. and and Obraztsov, V. and Olshevski, A. and Onofre, A. and Orava, R. and and Osterberg, K. and Ouraou, A. and Oyanguren, A. and Paganoni, M. and and Paiano, S. and Palacios, J. P. and Palka, H. and Papadopoulou, Th. D. and and Pape, L. and Parkes, C. and Parodi, F. and Parzefall, U. and and Passeri, A. and Passon, O. and Peralta, L. and Perepelitsa, V. and and Perrotta, A. and Petrolini, A. and Piedra, J. and Pieri, L. and Pierre, and F. and Pimenta, M. and Piotto, E. and Podobnik, T. and Poireau, V. and and Pol, M. E. and Polok, G. and Pozdniakov, V. and Pukhaeva, N. and Pullia, and A. and Radojicic, D. and Rames, J. and Read, A. and Rebecchi, P. and and Rehn, J. and Reid, D. and Reinhardt, R. and Renton, P. and Richard, F. and and Ridky, J. and Rivero, M. and Rodriguez, D. and Romero, A. and and Ronchese, P. and Roudeau, P. and Rovelli, T. and Ruhlmann-Kleider, V. and and Ryabtchikov, D. and Sadovsky, A. and Salmi, L. and Salt, J. and and Sander, C. and Savoy-Navarro, A. and Schwickerath, U. and Sekulin, R. and and Siebel, M. and Sisakian, A. and Smadja, G. and Smirnova, O. and and Sokolov, A. and Sopczak, A. and Sosnowski, R. and Spassov, T. and and Stanitzki, M. and Stocchi, A. and Strauss, J. and Stugu, B. and and Szczekowski, M. and Szeptycka, M. and Szumlak, T. and Tabarelli, T. and and Tegenfeldt, F. and Timmermans, J. and Tkatchev, L. and Tobin, M. and and Todorovova, S. and Tome, B. and Tonazzo, A. and Tortosa, P. and and Travnicek, P. and Treille, D. and Tristram, G. and Trochimczuk, M. and and Troncon, C. . and Turluer, M-L. and Tyapkin, I. A. and Tyapkin, P. and and Tzamarias, S. and Uvarov, V. and Valenti, G. and Van Dam, P. and Van and Eldik, J. and Van Lysebetten, A. and Van Remortel, N. and Van Vulpen, I. and and Vegni, G. and Veloso, F. and Venus, W. and Verdier, P. and Verzi, V. and and Vilanova, D. and Vitale, L. and Vrba, V. and Wahlen, H. and and Washbrook, A. J. and Weiser, C. and Wicke, D. and Wickens, J. and and Wilkinson, G. and Winter, M. and Witek, M. and Yushchenko, O. and and Zalewska, A. and Zalewski, P. and Zavrtanik, D. and Zhuravlov, V. and and Zimin, N. I. and Zintchenko, A. and Zupan, M. and Collaboration, D",
    journal = "The European Physical Journal C - Particles and Fields",
    year = "2008",
    volume = "54",
    number = "3",
    pages = "345-364",
    publisher = "Springer-Verlag",
    issn = "1434-6044, 1434-6052",
    doi = "10.1140/epjc/s10052-008-0528-3",
    abstract = "A determination of the single W spin density matrix (SDM) elements in
the reaction e(+)e(-) -> W+W–> l nu q (q) over bar (l=e/mu) is reported
at centre-of-mass energies between 189 and 209GeV. The data sample used
corresponds to an integrated luminosity of 520pb(-1) taken by DELPHI
between 1998 and 2000. The single W SDM elements, rho(W +/-)(tau tau’)
(tau,tau’=+/- 1 or 0), are determined as a function of the W- production
angle with respect to the e(-) beam direction and are obtained from
measurements of the W decay products by the application of suitable
projection operators, Lambda(tau tau’), which assume the V-A coupling of
the W-boson to fermions.
The measured SDM elements are used to obtain the fraction of
longitudinally polarised Ws, with the result:
sigma(L)/sigma(tot) = 24.9 +/- 4.5 (stat) +/- 2.2 (syst)%
at a mean energy of 198 GeV. The SDM elements are also used to determine
the triple gauge couplings Delta g(1)(Z), Delta kappa(gamma),
lambda(gamma) and g(4)(Z), (kappa) over tilde (Z) and (lambda) over
tilde (Z). For the CP-violating couplings the results of single
parameter fits are:
g(4)(Z) = -0.39(-0.20)(+0.19)
(kappa) over tilde (Z) = -0.09(-0.05)(+0.08)
(lambda) over tilde (Z) = -0.08 +/- 0.07.
The errors are a combination of statistical and systematic errors. All
results are consistent with the Standard Model."
}