Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-05-13
Phys.Rev.D72:011104,2005
Physics
High Energy Physics
High Energy Physics - Experiment
Submitted to Physical Review D Rapid Communications 7 pages, 3 figures
Scientific paper
10.1103/PhysRevD.72.011104
We present a measurement of the fraction f+ of right-handed W bosons produced in top quark decays, based on a candidate sample of $t\bar{t}$ events in the lepton+jets decay mode. These data correspond to an integrated luminosity of 230pb^-1, collected by the DO detector at the Fermilab Tevatron $p\bar{p}$ Collider at sqrt(s)=1.96 TeV. We use a constrained fit to reconstruct the kinematics of the $t\bar{t}$ and decay products, which allows for the measurement of the leptonic decay angle $\theta^*$ for each event. 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+=0.00+-0.13(stat)+-0.07(syst). This measurement is consistent with the standard model prediction of f+=3.6x10^-4.
"D0 Collaboration
Abazov V.
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