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Combination of CDF and D0 measurements of the W boson helicity in top quark decays
Stockholm University, Faculty of Science, Department of Physics.
2012 (English)In: Physical Review D, ISSN 1550-7998, Vol. 85, no 7, 071106- p.Article in journal (Refereed) Published
Abstract [en]

We report the combination of recent measurements of the helicity of the W boson from top quark decay by the CDF and D0 collaborations, based on data samples corresponding to integrated luminosities of 2.7-5.4 fb(-1) of p (p) over bar collisions collected during Run II of the Fermilab Tevatron collider. Combining measurements that simultaneously determine the fractions of W bosons with longitudinal (f(0)) and right-handed (f(+)) helicities, we find f(0) = 0.722 +/- 0.081[+/- 0.062(stat) +/- 0.052(syst)] and f(+) = -0.033 +/- 0.046[+/- 0.034(stat) +/- 0.031(syst)]. Combining measurements where one of the helicity fractions is fixed to the value expected in the standard model, we find f(0) = 0.682 +/- 0.057[+/- 0.035(stat) +/- 0.046(syst)] for fixed f(+) and f(+) = -0.015 +/- 0.035[+/- 0.018(stat) +/- 0.030(syst)] for fixed f(0). The results are consistent with standard model expectations.

Place, publisher, year, edition, pages
2012. Vol. 85, no 7, 071106- p.
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-80303DOI: 10.1103/PhysRevD.85.071106ISI: 000303310000001OAI: diva2:556435


Available from: 2012-09-25 Created: 2012-09-17 Last updated: 2012-11-28Bibliographically approved

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Åsman, Barbro
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