• Rapid Communication

Measurement of the W boson helicity in top quark decays at D0

V. M. Abazov et al. (D0 Collaboration)
Phys. Rev. D 75, 031102(R) – Published 5 February 2007

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¯ events in the +jets and dilepton decay channels corresponding to an integrated luminosity of 370pb1 collected by the D0 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+<0.23 at 95% C.L.), consistent with the standard model prediction of f+=3.6×104.

  • Figure
  • Received 26 September 2006

DOI:https://doi.org/10.1103/PhysRevD.75.031102

©2007 American Physical Society

Authors & Affiliations

Click to Expand

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 75, Iss. 3 — 1 February 2007

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×