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AuthorsV.M. Abazov, . et al, S.J. de Jong, M. Demarteau, P. Houben, P.J. van den Berg
TitleModel-independent measurement of the W-boson helicity in top-quark decays at D0
JournalPhysical Review Letters
FacultyFaculty of Science
Institute/dept.FNWI: Institute for High Energy Physics (IHEF)
AbstractWe 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.
Document typeArticle
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