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W boson polarisation at LEP2

Abbiendi, G and Ainsley, C and Akesson, P F and Alexander, G and Allison, J and Amaral, P and Anagnostou, G and Anderson, K J and Arcelli, S and Asai, S and Axen, D and Azuelos, G and Bailey, I and Barberio, E and Barillari, T and Barlow, R J and Batley, R J and Bechtle, P and Behnke, T and Bell, K W and Bell, P J and Bella, G and Bellerive, A and Benelli, G and Bethke, S and Biebel, O and Boeriu, O and Bock, P and Boutemeur, M and Braibant, S and Brigliadori, L and Brown, R M and Buesser, K and Burckhart, H J and Campana, S and Carnegie, R K and Carter, A A and Carter, J R and Chang, C Y and Charlton, D G and Ciocca, C and Couchman, J and Csilling, A and Cuffiani, M and Dado, S and De Roeck, A and De Wolf, E A and Desch, K and Dienes, B and Donkers, M and Dubbert, J and Duchovni, E and Duckeck, G and Duerdoth, I P and Etzion, E and Fabbri, F and Feld, L and Ferrari, P and Fiedler, F and Fleck, I and Ford, M and Frey, A and Gagnon, P and Gary, J W and Gaycken, G and Geich-Gimbel, C and Giacomelli, G and Giacomelli, P and Giunta, M and Goldberg, J and Gross, E and Grunhaus, J and Gruwe, M and Gunther, P O and Gupta, A and Hajdu, C and Hamann, M and Hanson, G G and Harel, A and Hauschild, M and Hawkes, C M and Hawkings, R and Hemingway, R J and Herten, G and Heuer, R D and Hill, J C and Hoffman, K and Horvath, D and Igo-Kemenes, P and Ishii, K and Jeremie, H and Jovanovic, P and Junk, T R and Kanaya, N and Kanzaki, J and Karlen, D and Kawagoe, K and Kawamoto, T and Keeler, R K and Kellogg, R G and Kenendy, B W and Klein, K and Klier, A and Kluth, S and Kobayashi, T and Kobel, M and Komamiya, S and Kramer, T and Krieger, P and von Krogh, K and Kruger, K and Kuhl, T and Kupper, M and Lafferty, G D and Landsman, H and Lanske, D and Layter, J G and Lellouch, D and Letts, J and Levinson, L and Lillich, J and Lloyd, S L and Loebinger, F K and Lu, J and Ludwig, A and Ludwig, J and Mader, W and Marcellini, S and Martin, A J and Masetti, G and Mashimo, T and Mattig, P and McKenna, J and McPherson, R A and Meijers, F and Menges, W and Merritt, F S and Mes, H and Michelini, A and Mihara, S and Mikenberg, G and Miller, D J and Moed, S and Mohr, W and Mori, T and Mutter, A and Nagai, K and Nakamura, I and Nanjo, H and Neal, H A and Nisius, R and O'Neale, S W and Oh, A and Okpara, A and Oreglia, M J and Orito, S and Pahl, C and Pasztor, G and Pater, J R and Pilcher, J E and Pinfold, J and Plane, D E and Poli, B and Pooth, O and Przybycien, M and Quadt, A and Rabbertz, K and Rembser, C and Renkel, P and Roney, J M and Rosati, S and Rozen, Y and Runge, K and Sachs, K and Saeki, T and Sarkisyan, E K G and Schaile, A D and Schaile, O and Scharff-Hansen, P and Schieck, J and Schorner-Sadenius, T and Schroder, M and Schumacher, M and Scott, W G and Seuster, R and Shears, T G and Shen, B C and Sherwood, P and Skuja, A and Smith, A M and Sobie, R and Soldner-Rembold, S and Spano, F and Stahl, A and Strom, D and Strohmer, R and Tarem, S and Tasevsky, M and Teuscher, R and Thomson, M A and Torrence, E and Toya, D and Tran, P and Trigger, I and Trocsanyi, Z and Tsur, E and Turner-Watson, M F and Ueda, I and Ujvari, B and Vollmer, C F and Vannerem, P and Vertesi, R 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 Wilson, G W and Wilson, J A and Wolf, G and Wyatt, T R and Yamashita, S and Zer-Zion, D and Zivkovic, L and , OPAL Collaboration (2004) W boson polarisation at LEP2. Physics Letters B, 585 (3-4). pp. 223-236. ISSN 0370-2693

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Abstract

Elements of the spin density matrix for W bosons in e(+)e(-) --> W+W- --> q (q) over barq'lv(l) events are measured from data recorded by the OPAL detector at LEP. This information is used to calculate polarised differential cross-sections and to search for CP-violating effects. Results are presented for W bosons produced in e+e- Collisions with centre-of-mass energies between 183 GeV and 209 GeV. The average fraction of W bosons that are longitudinally polarised is found to be (23.9 +/- 2.1 +/- 1.1)% compared to a Standard Model prediction of (23.9 +/- 0.1)%. All results are consistent with CP conservation. (C) 2004 Elsevier B.V. All rights reserved.

Item Type: Article
Journal or Publication Title: Physics Letters B
Uncontrolled Keywords: MONTE-CARLO PROGRAM ; TRIPLE GAUGE COUPLINGS ; E(+)E(-) COLLISIONS ; W+W-PRODUCTION ; EVENT GENERATOR ; 4-FERMION PROCESSES ; PAIR PRODUCTION ; FINAL-STATES ; ENERGIES ; EXPONENTIATION
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 52311
Deposited By: ep_importer_pure
Deposited On: 12 Jan 2012 14:46
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:00
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/52311

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