Measurement of W Polarisation at LEP
High Energy Physics - Experiment
2012-08-27 v1
Abstract
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.
Cite
@article{arxiv.hep-ex/0301027,
title = {Measurement of W Polarisation at LEP},
author = {L3 Collaboration},
journal= {arXiv preprint arXiv:hep-ex/0301027},
year = {2012}
}