# Measurement of the W boson helicity in top quark decay at D0

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 ttbar events in the l+jets and dilepton decay channels corresponding to an integrated luminosity of 370 pb^-1 collected by the DO detector at the Fermilab Tevatron ppbar Collider at sqrt{s}=1.96 TeV. We reconstruct the decay angle theta^* for each lepton. By comparing the \cos\theta^* distribution from the data with those for the expected background and signal for various values of f_+, 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 x10^-4.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00101469
Contributor : Sylvie Flores <>
Submitted on : Wednesday, September 27, 2006 - 11:51:14 AM
Last modification on : Wednesday, September 16, 2020 - 4:11:29 PM

### Citation

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, et al.. Measurement of the W boson helicity in top quark decay at D0. Physical Review D, American Physical Society, 2007, 75, pp.031102. ⟨10.1103/PhysRevD.75.031102⟩. ⟨in2p3-00101469⟩

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