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Measurement of W polarisation at LEP

CollaborationWith : Achard, Pablo / Bourquin, Maurice / Braccini, Saverio / Chamizo Llatas, Maria / Deglon, Patrick / Delmeire, Evelyne / Echenard, Bertrand / Extermann, Pierre / Field, John / Kienzle, Maria-Novella / Malgeri, Luca / Natale, Sonia / Pohl, Martin / Straessner, Arno
Published in Physics Letters. B. 2003, vol. 557, no. 3-4, p. 147-156
Abstract The three different helicity states of W bosons produced in the reaction e+e-→lvqq 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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L3 COLLABORATION. Measurement of W polarisation at LEP. In: Physics Letters. B, 2003, vol. 557, n° 3-4, p. 147-156. https://archive-ouverte.unige.ch/unige:43060

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Deposited on : 2014-12-11

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