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Model-independent measurement of the W-boson helicity in top-quark decays at D0
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2008 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 100, no 6, 062004Article in journal (Refereed) Published
Abstract [en]

We present the first model-independent measurement of the helicity of W bosons produced in top quark decays, based on a 1 fb(-1) sample of candidate t (t) over bar events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron p (p) over bar Collider. We reconstruct the angle theta(*) between the momenta of the down-type fermion and the top quark in the W boson rest frame for each top quark decay. A fit of the resulting cos theta(*) distribution finds that the fraction of longitudinal W bosons f(0)=0.425 +/- 0.166(stat)+/- 0.102(syst) and the fraction of right-handed W bosons f(+)=0.119 +/- 0.090(stat)+/- 0.053(syst), which is consistent at the 30% C.L. with the standard model.

Place, publisher, year, edition, pages
2008. Vol. 100, no 6, 062004
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-260395DOI: 10.1103/PhysRevLett.100.062004ISI: 000253238400017OAI: oai:DiVA.org:uu-260395DiVA: diva2:846993
Available from: 2015-08-18 Created: 2015-08-18 Last updated: 2015-08-18Bibliographically approved

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