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 (2004) W boson polarisation at LEP2. Physics Letters B, 585 (3-4). pp. 223-236. ISSN 0370-2693

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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:
Journal Article
Journal or Publication Title:
Physics Letters B
Uncontrolled Keywords:
?? monte-carlo programtriple gauge couplingse(+)e(-) collisionsw+w-productionevent generator4-fermion processespair productionfinal-statesenergiesexponentiationphysicsnuclear and high energy physics ??
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Deposited On:
12 Jan 2012 14:46
Last Modified:
15 Jul 2024 12:36