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Measurement of W boson polarisations and CP-violating triple gauge couplings from W+W- production at LEP

Abbiendi, G and Ackerstaff, K and Ainsley, C and Akesson, P F and Alexander, G and Allison, J and Anderson, K J and Arcelli, S and Asai, S and Ashby, S F and Axen, D and Azuelos, G and Bailey, I and Ball, A H and Barberio, E and Barlow, R J and Baumann, S and Behnke, T and Bell, K W and Bella, G and Bellerive, A and Benelli, G and Bentvelsen, S and Bethke, S and Biebel, O and Bloodworth, I J and Boeriu, O and Bock, P and Bohme, J and Bonacorsi, D and Boutemeur, M and Braibant, S and Bright-Thomas, P and Brigliadori, L and Brown, R M and Burckhart, H J and Cammin, J and Capiluppi, P and Carnegie, R K and Carter, A A and Carter, J R and Chang, C Y and Charlton, D G and Clarke, P E L and Clay, E and Cohen, I and Cooke, O C and Couchman, J and Couyoumtzelis, C and Coxe, R L and Csilling, A and Cuffiani, M and Dado, S and Dallavalle, G M and Dallison, S and de Roeck, A and de Wolf, E and Dervan, P and Desch, K and Dienes, B and Dixit, M S and Donkers, M and Dubbert, J and Duchovni, E and Duckeck, G and Duerdoth, I P and Estabrooks, P G and Etzion, E and Fabbri, F and Fanti, N and Feld, L and Ferrari, P and Fiedler, F and Fleck, I and Ford, M and Frey, A and Furtjes, A and Futyan, D I and Gagnon, P and Gary, J W and Gaycken, G and Geich-Gimbel, C and Giacomelli, G and Giacomelli, P and Glenzinski, D and Goldberg, J and Grandi, C and Graham, K and Gross, E and Grunhaus, J and Gruwe, M and Gunther, P O and Hajdu, C and Hanson, G G and Hansroul, M and Hapke, M and Harder, K and Harel, A and Harin-Dirac, M and Hauke, A and Hauschild, M and Hawkes, C M and Hawkings, R and Hemingway, R J and Hensel, C and Herten, G and Heuer, R D and Hill, J C and Hocker, A and Hoffman, K and Homer, R J and Honma, A K and Horvath, D and Hossain, K R and Howard, R and Huntemeyer, P and Igo-Kemenes, P and Ishii, K and Jacob, F R and Jawahery, A and Jeremie, H and Jones, C R and Jovanovic, P and Junk, T R and Kanaya, N and Kanzaki, J and Karapetian, G and Karlen, D and Kartvelishvili, V and Kawagoe, K and Kawamoto, T and Keeler, R K and Kellogg, R G and Kennedy, B W and Kim, D H and Klein, K and Klier, A and Kluth, S and Kobayashi, T and Kobel, M and Kokott, T P and Komaniya, S and Kowalewski, R V and Kress, T and Krieger, P and von Krogh, J and Kuhl, T and Kupper, M and Kyberd, P and Levinson, L and Liebisch, R and Lillich, J and List, B and Littlewood, C and Lloyd, A W and Lloyd, S L and Loebinger, F K and Long, G D and Losty, M J and Lu, J and Ludwig, J and Macchiolo, A and Macpherson, A and Mader, W and Marcellini, S and Marchant, T E and Martin, A J and Martin, J P and Martinez, G and Mashimo, T and Mattig, P and McDonald, W J and McKenna, J and McMahon, T J and McPherson, R A and Meijers, F and Mendez-Lorenzo, P and Menges, W and Merritt, F S and Mes, H and Michelini, A and Mihara, S and Mikenberg, G and Miller, D J and Mohr, W and Montanari, A and Mori, T and Nagai, K and Nakamura, I and Neal, H A and Nisius, R and O'Neale, S W and Oakham, F G and Odorici, F and Ogren, H O and Oh, A and Okpara, A and Oreglia, M J and Orito, S and Pasztor, G and Pater, J R and Patrick, G N and Patt, J and Pfeifenschneider, P and Pilcher, J E and Pinfold, J and Plane, D E and Poli, B and Polok, J and Pooth, O and Przybycien, M and Quadt, A and Rembser, C and Renkel, P and Rick, H and Rodning, N and Roney, J M and Rosati, S and Roscoe, K and Rossi, A M and Rozen, Y and Runge, K and Runolfssou, O and Rust, D R and Sachs, K and Saeki, T and Sahr, O and Sarkisyan, E K G and Sbarra, C and Schaile, A D and Schaile, O and Scharff-Hansen, P and Schroder, M and Schumacher, T and Schwick, C and Scott, W G and Seuster, R and Shears, T G and Shen, B C and Shepherd-Themistocleous, C H and Sherwood, P and Siroli, G P and Skuja, A and Smith, A M and Snow, G A and Sobie, R and Soldner-Rembold, S and Spagnolo, S and Sproston, M and Stahl, A and Stephens, K and Stoll, K and Strom, D and Strohmer, R and Stumpf, L and Surrow, B and Talbot, S D and Tarem, S and Taylor, R J and Teuscher, R and Thiergen, M and Thomas, J and Thomson, M A and Torrence, E and Towers, S and Toya, D and Trefzger, T and Trigger, I and Trocsanyi, Z and Tsur, E and Turner-Watson, M F and Ueda, I and Vachon, B and Vannerem, P and Verzocchi, M and Voss, H and Vossebeld, J and Waller, D and Ward, C P and Ward, D R and Watkins, P M and Watson, A T and Watson, N K and Wells, P S and Wengler, T and Wermes, N and Wetterling, D and White, J S and Wilson, G W and Wilson, J A and Wyatt, T R and Yamashita, S and Zacek, V and Zer-Zion, D and , OPAL Collaboration (2001) Measurement of W boson polarisations and CP-violating triple gauge couplings from W+W- production at LEP. European Physical Journal C: Particles and Fields, 19 (2). pp. 229-240. ISSN 1434-6044

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Abstract

Measurements are presented of the polarisation of W+W- boson pairs produced in e(+)e(-) collisions. and of CP-violating WWZ and WW gamma 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 (LL)/sigma (total) = (1.8 +/- 14.7 +/- 3.8)%. In the CP-violating trilinear gauge coupling sector we find <(<kappa>)over tilde> = -0.02 (+0.10)(-0.07), g(4)(z) = -0.02(-0.33)(+0.32) and <(<lambda>)over tilde>(z) = -0.18(-0.16)(+0.24), 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)(L) x U(1)(Y) symmetry. These results are consistent with Standard Model expectations.

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Uncontrolled Keywords: ELECTRIC-DIPOLE MOMENT ; MONTE-CARLO PROGRAM ; E(+)E(-) COLLISIONS ; EVENT GENERATOR ; PAIR-PRODUCTION ; CROSS-SECTIONS ; ENERGIES ; MASS ; PHOTOPRODUCTION ; E+E-->W+W
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Physics
ID Code: 53120
Deposited By: ep_importer_pure
Deposited On: 09 Mar 2012 03:00
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:01
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/53120

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