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Home > Research > Publications & Outputs > W boson polarisation at LEP2
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W boson polarisation at LEP2

Research output: Contribution to journalJournal article

Published

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  • OPAL Collaboration
Journal publication date15/04/2004
JournalPhysics Letters B
Journal number3-4
Volume585
Number of pages14
Pages223-236
Original languageEnglish

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.