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Direct observation of longitudinally polarised W± bosons

CollaborationWith : Achard, Pablo / Ambrosi, Giovanni / Bourquin, Maurice / Braccini, Saverio / Chamizo Llatas, Maria / Deglon, Patrick / Delmeire, Evelyne / Extermann, Pierre / Field, John / Kienzle, Maria-Novella / Muheim, Franz / Pohl, Martin / Produit, Nicolas / Sciarrino, Deborah
Published in Physics Letters. B. 2000, vol. 474, no. 1-2, p. 194-204
Abstract The three different helicity states of W± bosons, produced in the reaction e+e-W+W-lvqqare studied using leptonic and hadronic W decays at √s=183 GeV and 189 GeV. The W polarisation is also measured as a function of the scattering angle between the W− and the direction of the e− beam. The analysis demonstrates that W bosons are produced with all three helicities, the longitudinal and the two transverse states. Combining the results from the two center-of-mass energies and with leptonic and hadronic W decays, the fraction of longitudinally polarised W± bosons is measured to be 0.261 ± 0.051(stat.) ± 0.016(syst.) in agreement with the expectation from the Standard Model.
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L3 COLLABORATION. Direct observation of longitudinally polarised W± bosons. In: Physics Letters. B, 2000, vol. 474, n° 1-2, p. 194-204. https://archive-ouverte.unige.ch/unige:47219

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Deposited on : 2015-02-23

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