Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2

Επιστημονική δημοσίευση - Άρθρο Περιοδικού uoadl:3138604 29 Αναγνώσεις

Μονάδα:
Ερευνητικό υλικό ΕΚΠΑ
Τίτλος:
Study of W-boson polarisations and triple gauge boson couplings in the
reaction e(+)e(-)-> W+W- at LEP 2
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
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.
Έτος δημοσίευσης:
2008
Συγγραφείς:
Abdallah, J.
Abreu, P.
Adam, W.
Adzic, P.
Albrecht, T.
and Alemany-Fernandez, R.
Allmendinger, T.
Allport, P. P. and
Amaldi, U.
Amapane, N.
Amato, S.
Anashkin, E.
Andreazza,
A.
Andringa, S.
Anjos, N.
Antilogus, P.
Apel, W. -D. and
Arnoud, Y.
Ask, S.
Asman, B.
Augustin, J. E.
Augustinus,
A.
Baillon, P.
Ballestrero, A.
Bambade, P.
Barbier, R.
and Bardin, D.
Barker, G. J.
Baroncelli, A.
Battaglia, M.
and Baubillier, M.
Becks, K-H.
Begalli, M.
Behrmann, A. and
Ben-Haim, E.
Benekos, N.
Benvenuti, A.
Berat, C. and
Berggren, M.
Bertrand, D.
Besancon, M.
Besson, N.
Bloch,
D.
Blom, M.
Bluj, M.
Bonesini, M.
Boonekamp, M. and
Booth, P. S. L.
Borisov, G.
Botner, O.
Bouquet, B. and
Bowcock, T. J. V.
Boyko, I.
Bracko, M.
Brenner, R. and
Brodet, E.
Bruckman, P.
Brunet, J. M.
Buschbeck, B. and
Buschmann, P.
Calvi, M.
Camporesi, T.
Canale, V.
Carena,
F.
Castro, N.
Cavallo, F.
Chapkin, M.
Charpentier, Ph.
and Checchia, P.
Chierici, R.
Chliapnikov, P.
Chudoba, J.
and Chung, S. U.
Cieslik, K.
Collins, P.
Contri, R. and
Cosme, G.
Cossutti, F.
Costa, M. J.
Crennell, D.
Cuevas,
J.
D'Hondt, J.
da Silva, T.
Da Silva, W.
Della Ricca, G.
and De Angelis, A.
De Boer, W.
De Clercq, C.
De Lotto, B.
and De Maria, N.
De Min, A.
De Paula, L.
Di Ciaccio, L. and
Di Simone, A.
Doroba, K.
Drees, J.
Eigen, G.
Ekelof, T.
and Ellert, M.
Elsing, M.
Santo, M. C. Espirito
Fanourakis,
G.
Fassouliotis, D.
Feindt, M.
Fernandez, J.
Ferrer, A.
and Ferro, F.
Flagmeyer, U.
Foeth, H.
Fokitis, E. and
Fulda-Quenzer, F.
Fuster, J.
Gandelman, M.
Garcia, C. and
Gavillet, Ph.
Gazis, E.
Gokieli, R.
Golob, B. and
Gomez-Ceballos, G.
Goncalves, P.
Graziani, E.
Grosdidier, G.
and Grzelak, K.
Guy, J.
Haag, C.
Hallgren, A.
Hamacher,
K.
Hamilton, K.
Haug, S.
Hauler, F.
Hedberg, V. and
Hennecke, M.
Hoffman, J. .
Holmgren, S-O.
Holt, P. J. and
Houlden, M. A.
Jackson, J. N.
Jarlskog, G.
Jarry, P. and
Jeans, D.
Johansson, E. K.
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Joram, C. and
Jungermann, L.
Kapusta, F.
Katsanevas, S.
Katsoufis, E. and
Kernel, G.
Kersevan, B. P.
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King, B. T.
Kjaer,
N. J.
Kluit, P.
Kokkinias, P.
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Kouznetsov, O.
Krumstein, Z.
Kucharczyk, M.
Lamsa, J. and
Leder, G.
Ledroit, F.
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Leitner, R.
Lemonne,
J.
Lepeltier, V.
Lesiak, T.
Liebig, W.
Liko, D. and
Lipniacka, A.
Lopes, J. H.
Lopez, J. M.
Loukas, D.
Lutz,
P.
Lyons, L.
MacNaughton, J.
Malek, A.
Maltezos, S. and
Mandl, F.
Marco, J.
Marco, R.
Marechal, B.
Margoni, M.
and Marin, J-C.
Mariotti, C.
Markou, A.
Martinez-Rivero, C.
and Masik, J.
Mastroyiannopoulos, N.
Matorras, F.
Matteuzzi,
C.
Mazzucato, F.
Mazzucato, M.
Mc Nulty, R.
Meroni, C.
and Migliore, E.
Mitaroff, W.
Mjoernmark, U.
Moa, T. and
Moch, M.
Moenig, K.
Monge, R.
Montenegro, J.
Moraes, D.
and Moreno, S.
Morettini, P.
Mueller, U.
Muenich, K. and
Mulders, M.
Mundim, L.
Murray, W.
Muryn, B.
Myatt, G.
and Myklebust, T.
Nassiakou, M.
Navarria, F.
Nawrocki, K.
and Nicolaidou, R.
Nikolenko, M.
Oblakowska-Mucha, A. and
Obraztsov, V.
Olshevski, A.
Onofre, A.
Orava, R. and
Osterberg, K.
Ouraou, A.
Oyanguren, A.
Paganoni, M. and
Paiano, S.
Palacios, J. P.
Palka, H.
Papadopoulou, Th. D.
and Pape, L.
Parkes, C.
Parodi, F.
Parzefall, U. and
Passeri, A.
Passon, O.
Peralta, L.
Perepelitsa, V. and
Perrotta, A.
Petrolini, A.
Piedra, J.
Pieri, L.
Pierre,
F.
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Podobnik, T.
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Pol, M. E.
Polok, G.
Pozdniakov, V.
Pukhaeva, N.
Pullia,
A.
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Read, A.
Rebecchi, P. and
Rehn, J.
Reid, D.
Reinhardt, R.
Renton, P.
Richard, F.
and Ridky, J.
Rivero, M.
Rodriguez, D.
Romero, A. and
Ronchese, P.
Roudeau, P.
Rovelli, T.
Ruhlmann-Kleider, V.
and Ryabtchikov, D.
Sadovsky, A.
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Sander, C.
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Schwickerath, U.
Sekulin, R.
and Siebel, M.
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Stanitzki, M.
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Strauss, J.
Stugu, B. and
Szczekowski, M.
Szeptycka, M.
Szumlak, T.
Tabarelli, T. and
Tegenfeldt, F.
Timmermans, J.
Tkatchev, L.
Tobin, M. and
Todorovova, S.
Tome, B.
Tonazzo, A.
Tortosa, P. and
Travnicek, P.
Treille, D.
Tristram, G.
Trochimczuk, M. and
Troncon, C. .
Turluer, M-L.
Tyapkin, I. A.
Tyapkin, P. and
Tzamarias, S.
Uvarov, V.
Valenti, G.
Van Dam, P.
Van
Eldik, J.
Van Lysebetten, A.
Van Remortel, N.
Van Vulpen, I.
and Vegni, G.
Veloso, F.
Venus, W.
Verdier, P.
Verzi, V.
and Vilanova, D.
Vitale, L.
Vrba, V.
Wahlen, H. and
Washbrook, A. J.
Weiser, C.
Wicke, D.
Wickens, J. and
Wilkinson, G.
Winter, M.
Witek, M.
Yushchenko, O. and
Zalewska, A.
Zalewski, P.
Zavrtanik, D.
Zhuravlov, V. and
Zimin, N. I.
Zintchenko, A.
Zupan, M.
Collaboration, D
Περιοδικό:
The European Physical Journal C - Particles and Fields
Εκδότης:
Springer-Verlag
Τόμος:
54
Αριθμός / τεύχος:
3
Σελίδες:
345-364
Επίσημο URL (Εκδότης):
DOI:
10.1140/epjc/s10052-008-0528-3
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