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Measurement of the W boson helicity in top quark decays at D0
Baringer, Philip S. Bean, Alice Coppage, Don Gardner, J. Hensel, Carsten Moulik, Tania Wilson, Graham Wallace
Baringer, Philip S.
Bean, Alice
Coppage, Don
Gardner, J.
Hensel, Carsten
Moulik, Tania
Wilson, Graham Wallace
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Abstract
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-bar 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-bar Collider at s√=1.96 TeV. 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(+)<0.23 at 95% C.L.), consistent with the standard model prediction of f(+)=3.6×10(−4).
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This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.75.031102.
Date
2007-02-05
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American Physical Society
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V. M. Abazov et al. (D0 Collaboration). (2007). "Measurement of the W boson helicity in top quark decays at D0." Physical Review D, 75(3):031102. http://dx.doi.org/10.1103/PhysRevD.75.031102