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Measurement of the W boson helicity in top quark decays using 5.4 fb(-1) of p(p)over-bar collision data
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2011 (English)In: Physical Review D - Particles, Fields, Gravitation and Cosmology, ISSN 1550-7998, Vol. 83, no 3, p. 032009-Article in journal (Refereed) Published
Abstract [en]

We present a measurement of the helicity of the W boson produced in top quark decays using t (t) over bar decays in the l + jets and dilepton final states selected from a sample of 5.4 fb(-1) of collisions recorded using the D0 detector at the Fermilab Tevatron p (p) over bar collider. We measure the fractions of longitudinal and right-handed W bosons to be f(0) = 0.669 +/- 0.102[+/- 0.078(stat.) +/- 0.065(syst.) +/- and f(+) = 0.023 +/- 0.053[+/- 0.041(stat.) +/- 0.034(syst.)], respectively. This result is consistent at the 98% level with the standard model. A measurement with f(0) fixed to the value from the standard model yields f(+) = 0.010 +/- 0.037[+/- 0.022(stat.) +/- 0.030(syst.).].

Place, publisher, year, edition, pages
2011. Vol. 83, no 3, p. 032009-
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Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-148996DOI: 10.1103/PhysRevD.83.032009ISI: 000287486700001OAI: oai:DiVA.org:uu-148996DiVA, id: diva2:403653
Available from: 2011-03-14 Created: 2011-03-14 Last updated: 2013-03-01Bibliographically approved

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