W Boson Polarisation at LEP2

Details W Boson Polarisation at LEP2 W Boson Polarisation at LEP2

2003-12-17

arxiv.org/abs/hep-ex/0312047v1

Phys.Lett.B585:223-236,2004

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages, 3 figures, Submitted to Phys. Letts. B

Scientific paper

10.1016/j.physletb.2004.02.003

Elements of the spin density matrix for W bosons in e+e- -> W+W- -> qqln events are measured from data recorded by the OPAL detector at LEP. This information is used 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.

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