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Model-independent Measurement of the W-Boson Helicity in Top-Quark Decays at D0
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2008 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 100, no 6, 062004- p.Article 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- p.
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-15496DOI: 10.1103/PhysRevLett.100.062004ISI: 000253238400017OAI: diva2:182016
Publikationen har totalt 548 författareAvailable from: 2008-12-09 Created: 2008-12-09 Last updated: 2011-09-22Bibliographically approved

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Åsman, BarbroStrandberg, Sara
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