Measurement of W Polarisation at LEP

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.

Cited by in corpus (17)

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• Discriminating Z' from anomalous trilinear gauge coupling signatures in e+e- \to W+W- at ILC with polarized beams
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• Anomalous quartic WWgammagamma and WWZgamma couplings through WWZ production in gamma gamma colliders
• Observation of gauge boson joint-polarisation states in $W^{\pm }Z$ production from $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Anomalous Higgs couplings in egamma collision with initial beam and final state polarizations
• Anomalous WWH couplings in gamma gamma collision with initial beams and final state polarizations
• Physics of W bosons at LEP
• Fully analytical O(α_s) results for on-shell and off-shell polarized W-boson decays into massive quark pairs
• Study of Spin and Decay-Plane Correlations of W Bosons in the e+e- -> W+W- Process at LEP
• $WZ$ Production at $e\gamma$ Colliders and Anomalous Quartic $WWZ\gamma$ Coupling
• Unique heavy lepton signature at $e^{+}{e}^{-}$ linear collider with polarized beams
• Correlations between Polarisation States of W Particles in the Reaction e-e+ -> W-W+ at LEP2 Energies 189-209 GeV
• Polarisation of electroweak gauge bosons at the LHC
• Spectra, triple and quartic gauge couplings in a Higgsless model