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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.
|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|
|Departments:||Faculty of Science and Technology > Physics|
|Deposited On:||12 Jan 2012 14:46|
|Last Modified:||07 Jan 2015 17:09|
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