Journal article
Measurement of W boson polarisations and CP-violating triple gauge couplings from W W- production at LEP
G Abbiendi, K Ackerstaff, C Ainsley, PF Åkesson, G Alexander, J Allison, KJ Anderson, S Arcelli, S Asai, SF Ashby, D Axen, G Azuelos, I Bailey, AH Ball, E Barberio, RJ Barlow, S Baumann, T Behnke, KW Bell, G Bella Show all
European Physical Journal C | Published : 2001
Abstract
Measurements are presented of the polarisation of W+W- boson pairs produced in e+e- collisions, and of CP-violating WWZ and WWγ 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 σL/σtotal = (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 σTT/σtotal = (78.1 ± 9.0 ± 3.2)%, σLL/σto..
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