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Model-Independent Measurement of the W-Boson Helicity in Top-Quark Decays at D0

dc.contributor.authorBaringer, Philip S.
dc.contributor.authorBean, Alice
dc.contributor.authorHensel, Carsten
dc.contributor.authorMoulik, Tania
dc.contributor.authorWilson, Graham Wallace
dc.contributor.authorAbazov, V. M.
dc.contributor.authorAbbott, B.
dc.contributor.authorAbolins, M.
dc.contributor.authorAcharya, B. S.
dc.contributor.authorAdams, M.
dc.contributor.authorAdams, T.
dc.date.accessioned2014-11-03T15:30:35Z
dc.date.available2014-11-03T15:30:35Z
dc.date.issued2008-02-14
dc.identifier.citationV. M. Abazov et al. (D0 Collaboration). (2008). "Measurement of the tt-bar Production Cross Section in pp-bar Collisions at s√=1.96  TeV." Physical Review Letters, 100(6):062004. http://dx.doi.org/10.1103/PhysRevLett.100.062004.
dc.identifier.issn0031-9007
dc.identifier.urihttp://hdl.handle.net/1808/15488
dc.descriptionThis is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.100.062004.
dc.description.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 tt-bar events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron pp-bar Collider. We reconstruct the angle θ* 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 cosθ* 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.
dc.publisherAmerican Physical Society
dc.titleModel-Independent Measurement of the W-Boson Helicity in Top-Quark Decays at D0
dc.typeArticle
kusw.kuauthorBaringer, Philip S.
kusw.kuauthorBean, Alice
kusw.kuauthorHensel, Carsten
kusw.kuauthorMoulik, Tania
kusw.kuauthorWilson, Graham Wallace
kusw.kudepartmentPhysics and Astronomy
dc.identifier.doi10.1103/PhysRevLett.100.062004
kusw.oaversionScholarly/refereed, publisher version
kusw.oapolicyThis item does not meet KU Open Access policy criteria.
dc.rights.accessrightsopenAccess


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