CERN Accelerating science

Article
Report number hep-ex/0009021 ; CERN-EP-2000-113 ; CERN-EP-2000-113
Title Measurement of W boson polarisations and CP-violating triple gauge couplings from $W^{+}W^{-}$ production at LEP
Related titleCHARGE PARITY
Author(s)

Abbiendi, G. ; Ackerstaff, K. ; Ainsley, C. ; Akesson, P.F. ; Alexander, G. ; Allison, John ; Anderson, K.J. ; Arcelli, S. ; Asai, S. ; Ashby, S.F. ; Axen, D. ; Azuelos, G. ; Bailey, I. ; Ball, A.H. ; Barberio, E. ; Barlow, Roger J. ; Baumann, S. ; Behnke, T. ; Bell, Kenneth Watson ; Bella, G. ; Bellerive, A. ; Benelli, G. ; Bentvelsen, S. ; Bethke, S. ; Biebel, O. ; Bloodworth, I.J. ; Boeriu, O. ; Bock, P. ; Bohme, J. ; Bonacorsi, D. ; Boutemeur, M. ; Braibant, S. ; Bright-Thomas, P. ; Brigliadori, L. ; Brown, Robert M. ; Burckhart, H.J. ; Cammin, J. ; Capiluppi, P. ; Carnegie, R.K. ; Carter, A.A. ; Carter, J.R. ; Chang, C.Y. ; Charlton, David G. ; Clarke, P.E.L. ; Clay, E. ; Cohen, I. ; Cooke, O.C. ; Couchman, J. ; Couyoumtzelis, C. ; Coxe, R.L. ; Csilling, A. ; Cuffiani, M. ; Dado, S. ; Dallavalle, G.Marco ; Dallison, S. ; de Roeck, A. ; de Wolf, E. ; Dervan, P. ; Desch, K. ; Dienes, B. ; Dixit, M.S. ; Donkers, M. ; Dubbert, J. ; Duchovni, E. ; Duckeck, G. ; Duerdoth, I.P. ; Estabrooks, P.G. ; Etzion, E. ; Fabbri, F. ; Fanti, M. ; Feld, L. ; Ferrari, P. ; Fiedler, F. ; Fleck, I. ; Ford, M. ; Frey, A. ; Furtjes, A. ; Futyan, D.I. ; Gagnon, P. ; Gary, J.W. ; Gaycken, G. ; Geich-Gimbel, C. ; Giacomelli, G. ; Giacomelli, P. ; Glenzinski, D. ; Goldberg, J. ; Grandi, C. ; Graham, K. ; Gross, E. ; Grunhaus, J. ; Gruwe, M. ; Gunther, P.O. ; Hajdu, C. ; Hanson, G.G. ; Hansroul, M. ; Hapke, M. ; Harder, K. ; Harel, A. ; Harin-Dirac, M. ; Hauke, A. ; Hauschild, M. ; Hawkes, C.M. ; Hawkings, R. ; Hemingway, R.J. ; Hensel, C. ; Herten, G. ; Heuer, R.D. ; Hill, J.C. ; Hocker, James Andrew ; Hoffman, Kara Dion ; Homer, R.J. ; Honma, A.K. ; Horvath, D. ; Hossain, K.R. ; Howard, R. ; Huntemeyer, P. ; Igo-Kemenes, P. ; Ishii, K. ; Jacob, F.R. ; Jawahery, A. ; Jeremie, H. ; Jones, C.R. ; Jovanovic, P. ; Junk, T.R. ; Kanaya, N. ; Kanzaki, J. ; Karapetian, G. ; Karlen, D. ; Kartvelishvili, V. ; Kawagoe, K. ; Kawamoto, T. ; Keeler, R.K. ; Kellogg, R.G. ; Kennedy, B.W. ; Kim, D.H. ; Klein, K. ; Klier, A. ; Kluth, S. ; Kobayashi, T. ; Kobel, M. ; Kokott, T.P. ; Komamiya, S. ; Kowalewski, Robert V. ; Kress, T. ; Krieger, P. ; von Krogh, J. ; Kuhl, T. ; Kupper, M. ; Kyberd, P. ; Lafferty, G.D. ; Landsman, H. ; Lanske, D. ; Lawson, I. ; Layter, J.G. ; Leins, A. ; Lellouch, D. ; Letts, J. ; Levinson, L. ; Liebisch, R. ; Lillich, J. ; List, B. ; Littlewood, C. ; Lloyd, A.W. ; Lloyd, S.L. ; Loebinger, F.K. ; Long, G.D. ; Losty, M.J. ; Lu, J. ; Ludwig, J. ; Macchiolo, A. ; Macpherson, A. ; Mader, W. ; Marcellini, S. ; Marchant, T.E. ; Martin, A.J. ; Martin, J.P. ; Martinez, G. ; Mashimo, T. ; Mattig, Peter ; McDonald, W.John ; McKenna, J. ; McMahon, T.J. ; McPherson, R.A. ; Meijers, F. ; Mendez-Lorenzo, P. ; Menges, W. ; Merritt, F.S. ; Mes, H. ; Michelini, A. ; Mihara, S. ; Mikenberg, G. ; Miller, D.J. ; Mohr, W. ; Montanari, A. ; Mori, T. ; Nagai, K. ; Nakamura, I. ; Neal, H.A. ; Nisius, R. ; O'Neale, S.W. ; Oakham, F.G. ; Odorici, F. ; Ogren, H.O. ; Oh, A. ; Okpara, A. ; Oreglia, M.J. ; Orito, S. ; Pasztor, G. ; Pater, J.R. ; Patrick, G.N. ; Patt, J. ; Pfeifenschneider, P. ; Pilcher, J.E. ; Pinfold, J. ; Plane, David E. ; Poli, B. ; Polok, J. ; Pooth, O. ; Przybycien, M. ; Quadt, A. ; Rembser, C. ; Renkel, P. ; Rick, H. ; Rodning, N. ; Roney, J.M. ; Rosati, S. ; Roscoe, K. ; Rossi, A.M. ; Rozen, Y. ; Runge, K. ; Runolfsson, O. ; Rust, D.R. ; Sachs, K. ; Saeki, T. ; Sahr, O. ; Sarkisyan, E.K.G. ; Sbarra, C. ; Schaile, A.D. ; Schaile, O. ; Scharff-Hansen, P. ; Schroder, Matthias ; Schumacher, M. ; Schwick, C. ; Scott, W.G. ; Seuster, R. ; Shears, T.G. ; Shen, B.C. ; Shepherd-Themistocleous, C.H. ; Sherwood, P. ; Siroli, G.P. ; Skuja, A. ; Smith, A.M. ; Snow, G.A. ; Sobie, R. ; Soldner-Rembold, S. ; Spagnolo, S. ; Sproston, M. ; Stahl, A. ; Stephens, K. ; Stoll, K. ; Strom, David M. ; Strohmer, R. ; Stumpf, L. ; Surrow, B. ; Talbot, S.D. ; Tarem, S. ; Taylor, R.J. ; Teuscher, R. ; Thiergen, M. ; Thomas, J. ; Thomson, M.A. ; Torrence, E. ; Towers, S. ; Toya, D. ; Trefzger, T. ; Trigger, I. ; Trocsanyi, Z. ; Tsur, E. ; Turner-Watson, M.F. ; Ueda, I. ; Vachon, B. ; Vannerem, P. ; Verzocchi, M. ; Voss, H. ; Vossebeld, J. ; Waller, D. ; Ward, C.P. ; Ward, D.R. ; Watkins, P.M. ; Watson, A.T. ; Watson, N.K. ; Wells, P.S. ; Wengler, T. ; Wermes, N. ; Wetterling, D. ; White, J.S. ; Wilson, G.W. ; Wilson, J.A. ; Wyatt, T.R. ; Yamashita, S. ; Zacek, V. ; Zer-Zion, D.

Affiliation (CERN)
Publication 2001
Imprint 7 Sep 2000
Number of pages 24
In: Eur. Phys. J. C 19 (2001) 229-240
DOI 10.1007/s100520100602
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; OPAL
Abstract Measurements are presented of the polarisation of W+W- boson pairs produced in e+e- collisions, and of CP-violating WWZ and WWGamma trilinear gauge couplings. The data were recorded by the OPAL experiment at LEP during 1998, where a total integrated luminosity of 183 pb^-1 was obtained at a centre-of-mass energy of 189 GeV. The measurements are performed through a spin density matrix analysis of the W boson decay products. The fraction of W bosons produced with longitudinal polarisation was found to be sigma_L/sigma_total = (21.0 +- 3.3 +- 1.6)% where the first error is statistical and the second systematic. The joint W boson pair production fractions were found to be sigma_TT/sigma_total = (78.1 +- 9.0 +- 3.2) %, sigma_LL/sigma_total = (20.1 +- 7.2 +- 1.8) % and sigma_TL/sigma_total = (1.8 +- 14.7 +- 3.8) %. In the CP-violating trilinear gauge coupling sector we find kappa_z = -0.20 +0.10 -0.07, g^z_4 = -0.02 +0.32 -0.33 and lambda_z = -0.18 +0.24 -0.16, where errors include both statistical and systematic uncertainties. In each case the coupling is determined with all other couplings set to their Standard Model values except those related to the measured coupling via SU(2)_LxU(1)_Y symmetry. These results are consistent with Standard Model expectations.
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