Measurement of W-Boson Helicity Fractions in Top-Quark Decays Using costheta*
arXiv:0811.0344 · doi:10.1016/j.physletb.2009.02.040
Abstract
Fully reconstructed top-antitop-events are used to determine the fractions of right-handed and longitudinally polarized W bosons produced in top-quark decays. The helicity fractions are sensitive to the couplings and the Dirac structure of the Wtb vertex. This paper reports measurements of the W-boson helicity fractions from two different methods using data corresponding to an integrated luminosity of 1.9 fb-1 of proton-antiproton collisions collected by the CDF II detector operating at the Fermilab Tevatron.
17 pages, 3 figures. Submitted to PLB. This is the revised version as accepted by PLB