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Direct observation of longitudinally polarised W± bosons

Document type: Articulo

Abstract

The three different helicity states of W± bosons, produced in the reaction e+e−→W+W−→ℓνqq̄ are 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.

General information

Issue date: 10 de febrero de 2000
Document language: English
Journal: Physics Letters B; vol. 474, no. 1–2
Origin: Facultad de Ciencias Exactas
ISSN: 0370-2693
Pages: 194-204
xmlui.dri2xhtml.METS-1.0.item-dc-subject: Física ; W boson ; W polarisation ; W decay ; standar model
Subjects: Ciencias Exactas

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Created: 15 de julio de 2019
Available since: 15 de julio de 2019
Please, use one of this identificators(URI) for cite o linking this item:
  • http://sedici.unlp.edu.ar/handle/10915/78160
  • https://doi.org/10.1016/S0370-2693(99)01489-6

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    Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Except where otherwise noted, this item's license is described as Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)