Measurement of the W boson helicity in top quark decays at DO

Abazov, V. M. ; Mondal, N. K. ; et., al. (2007) Measurement of the W boson helicity in top quark decays at DO Physical Review D - Particles, Fields, Gravitation and Cosmology, 75 (3). No PP. Given.. ISSN 1550-7998

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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 370pb-1 collected by the D∅ detector at the Fermilab Tevatron pp- Collider at √s=1.96TeV. We reconstruct the decay angle θ for each lepton. By comparing the cosθ 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+Ũ0.23 at 95% C.L.), consistent with the standard model prediction of f+=3.6x10-4.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:89844
Deposited On:02 May 2012 13:01
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