W Boson Polarisation at LEP2

Abstract

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.

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

References in corpus (6)

• The Monte Carlo Program KoralW version 1.51 and The Concurrent Monte Carlo KoralW&YFSWW3 with All Background Graphs and First Order Corrections to W-Pair Production
• The Monte Carlo Event Generator YFSWW3 version 1.16 for W-Pair Production and Decay at LEP2/LC Energies
• Measurement of Triple Gauge-Boson Couplings at LEP up to 189GeV
• Precision Neutral Current Asymmetry Parameter Measurements from the Tau Polarization at LEP
• Probing triple gauge couplings with transverse beam polarisation in e+e- -> W+W-
• Measurement of W Polarisation at LEP

Cited by in corpus (17)

• Measurement of $W^{\pm }Z$ production cross sections and gauge boson polarisation in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Quantum state tomography, entanglement detection and Bell violation prospects in weak decays of massive particles
• Electroweak gauge boson polarisation at the LHC
• Study of W boson polarisations and Triple Gauge boson Couplings in the reaction e+e- -> W+W- at LEP 2
• Discriminating Z' from anomalous trilinear gauge coupling signatures in e+e- \to W+W- at ILC with polarized beams
• Anomalous quartic WWgammagamma and WWZgamma couplings through WWZ production in gamma gamma colliders
• Polarisations of the $Z$ and $W$ bosons in the processes $pp\to ZH$ and $pp\to W_{}^{\pm }H$
• 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
• Fully analytical O(α_s) results for on-shell and off-shell polarized W-boson decays into massive quark pairs
• Physics of W bosons at LEP
• Anomalous WWH couplings in gamma gamma collision with initial beams and final state polarizations
• $WZ$ 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