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

A determination of the single W spin density matrix (SDM) elements in the reaction e + e - →W + W - →lνqq̄(l=e/μ) is reported at centre-of-mass energies between 189 and 209 GeV. The data sample used corresponds to an integrated luminosity of 520 pb -1 taken by DELPHI between 1998 and 2000. The singl...

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Veröffentlicht in:	The European physical journal. C, Particles and fields Particles and fields, 2008-04, Vol.54 (3), p.345-364
Hauptverfasser:	Abreu, P., Adam, W., Amapane, N., Amato, S., Andringa, S., Ask, S., Augustinus, A., Barbier, R., Barker, G.J., Ben-Haim, E., Benvenuti, A., Berggren, M., Blom, M., Bonesini, M., Boonekamp, M., Borisov, G., Bracko, M., Brodet, E., Calvi, M., Chapkin, M., Chierici, R., Chung, S.U., Contri, R., Cossutti, F., Costa, M.J., Crennell, D., da Silva, T., De Boer, W., De Clercq, C., De Lotto, B., Eigen, G., Elsing, M., Fanourakis, G., Fernandez, J., Foeth, H., Fulda-Quenzer, F., Fuster, J., Hamacher, K., Hamilton, K., Hauler, F., Hoffman, J., Holmgren, S-O., Katsoufis, E., Kersevan, B.P., Kjaer, N.J., Kluit, P., Ledroit, F., Lemonne, J., Lepeltier, V., Liebig, W., Lopes, J.H., Malek, A., Mandl, F., Marin, J-C., Mastroyiannopoulos, N., Mc Nulty, R., Mjoernmark, U., Moa, T., Moch, M., Moraes, D., Morettini, P., Mulders, M., Myatt, G., Navarria, F., Nikolenko, M., Onofre, A., Paiano, S., Parzefall, U., Passeri, A., Piedra, J., Pimenta, M., Podobnik, T., Pol, M.E., Reid, D., Reinhardt, R., Richard, F., Ridky, J., Rovelli, T., Ruhlmann-Kleider, V., Ryabtchikov, D., Schwickerath, U., Sisakian, A., Smadja, G., Sopczak, A., Spassov, T., Stocchi, A., Timmermans, J., Todorovova, S., Tome, B., Tortosa, P., Trochimczuk, M., Troncon, C., Van Vulpen, I., Vegni, G., Wahlen, H., Weiser, C., Wickens, J., Yushchenko, O., Zavrtanik, D., Zintchenko, A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Astrophysics and Cosmology Couplings Elementary Particles Fermions Hadrons Heavy Ions High Energy Physics - Experiment Luminosity Measurement Science and Instrumentation Nuclear Energy Nuclear Physics Operators (mathematics) Physics Physics and Astronomy Quantum Field Theories Quantum Field Theory Quarks Regular Article - Experimental Physics String Theory Systematic errors Tungsten
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Zusammenfassung:	A determination of the single W spin density matrix (SDM) elements in the reaction e + e - →W + W - →lνqq̄(l=e/μ) is reported at centre-of-mass energies between 189 and 209 GeV. The data sample used corresponds to an integrated luminosity of 520 pb -1 taken by DELPHI between 1998 and 2000. The single W SDM elements, ρ ττ’ W± (τ,τ’=± 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, Λ ττ’ , 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: at a mean energy of 198 GeV. The SDM elements are also used to determine the triple gauge couplings Δg 1 Z ,Δκ γ ,λ γ and g 4 Z , and . For the CP-violating couplings the results of single parameter fits are: The errors are a combination of statistical and systematic errors. All results are consistent with the Standard Model.
ISSN:	1434-6044 1434-6052
DOI:	10.1140/epjc/s10052-008-0528-3