W Boson Polarisation at LEP2
High Energy Physics - Experiment
2008-11-26 v1
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.
Keywords
Cite
@article{arxiv.hep-ex/0312047,
title = {W Boson Polarisation at LEP2},
author = {The OPAL collaboration and G. Abbiendi},
journal= {arXiv preprint arXiv:hep-ex/0312047},
year = {2008}
}
Comments
20 pages, 3 figures, Submitted to Phys. Letts. B