Measurement of W polarisation at LEP

P. Achard,O. Adriani, M. Aguilar-Benitez,J. Alcaraz, G. Alemanni, J. Allaby,A. Aloisio,M.G. Alviggi, H. Anderhub,V.P. Andreev, F. Anselmo, A. Arefiev, T. Azemoon,T. Aziz, P. Bagnaia, A. Bajo, G. Baksay, L. Baksay,S.V. Baldew, S. Banerjee

Physics Letters B（2003）

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摘要

The three different helicity states of W bosons produced in the reaction e+e−→W+W−→ℓνqq̄′ at LEP are studied using leptonic and hadronic W decays. Data at centre-of-mass energies 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±0.027±0.016 where the first uncertainty is statistical and the second systematic, in agreement with the Standard Model expectation.

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