Measurement of W Polarisation at LEP

Details Measurement of W Polarisation at LEP Measurement of W Polarisation at LEP

2003-01-16

arxiv.org/abs/hep-ex/0301027v1

Phys.Lett.B557:147-156,2003

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1016/S0370-2693(03)00172-2

The three different helicity states of W bosons produced in the reaction e+ e- -> W+ W- -> l nu q q~ at LEP are studied using leptonic and hadronic W decays. Data at centre-of-mass energies \sqrt s = 183-209 GeV are used to measure the polarisation of W bosons, and its dependence on the W boson production angle. The fraction of longitudinally polarised W bosons is measured to be 0.218 \pm 0.027 \pm 0.016 where the first uncertainty is statistical and the second systematic, in agreement with the Standard Model expectation.

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