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Measurement of the W boson helicity in top quark decays at D0
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2007 (English)In: Physical Review D, ISSN 1550-7998, Vol. 75, no 3, 031102-1-031102-8 p.Article in journal (Refereed) Published
Abstract [en]

We present a measurement of the fraction f(+) of right-handed W bosons produced in top quark decays, based on a candidate sample of tt events in the l + jets and dilepton decay channels corresponding to an integrated luminosity of 370 pb(-1) collected by the D0 detector at the Fermilab Tevatron pp Collider at root s = 1.96 TeV. We reconstruct the decay angle theta* for each lepton. By comparing the cos theta* distribution from the data with that for the expected background and signal for various values of f(+) (where we assume that the fraction of longitudinally-polarized W bosons has the standard model value of 0.70), we find f(+) = 0.056 +/- 0.080 (stat) +/- 0.057 (syst) (f(+) < 0.23 at 95% C. L.), consistent with the standard model prediction of f(+) = 3.6 X 10(-4).

Place, publisher, year, edition, pages
2007. Vol. 75, no 3, 031102-1-031102-8 p.
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Subatomic Physics
URN: urn:nbn:se:kth:diva-34424DOI: 10.1103/PhysRevD.75.031102ISI: 000244534800002ScopusID: 2-s2.0-33846847460OAI: diva2:421221
QC 20110608Available from: 2011-06-08 Created: 2011-06-08 Last updated: 2012-02-02Bibliographically approved

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Clément, ChristopheGollub, NilsHansson, PerStrandberg, Jonas
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Particle and Astroparticle Physics
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