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Measurement of the W Boson Helicity in Top Quark Decays Using 5.4 fb-1 of $p\bar{p}$ Collision Data
Stockholm University, Faculty of Science, Department of Physics.
2011 (English)In: Physical Review D, ISSN 1550-7998, Vol. 83, no 3, 032009- p.Article in journal (Refereed) Published
##### Abstract [en]

We present a measurement of the helicity of the W boson produced in top quark decays using tt̅ 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 pp̅ collider. We measure the fractions of longitudinal and right-handed W bosons to be f0=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 f0 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, 032009- p.
##### National Category
Subatomic Physics
Physics
##### Identifiers
ISI: 000287486700001OAI: oai:DiVA.org:su-62692DiVA: diva2:443991
D0
##### Funder
Swedish Research Council
##### Note
Publikationen har totalt 429 författare, V. Abazov et al.Available from: 2011-09-27 Created: 2011-09-27 Last updated: 2012-01-26Bibliographically approved

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Physical Review D
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Subatomic Physics