# Measurement of W-Boson Helicity Fractions in Top-Quark Decays Using costheta

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.
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Journal articles

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Submitted on : Thursday, November 6, 2008 - 11:28:12 AM
Last modification on : Wednesday, September 15, 2021 - 2:56:02 PM

### Citation

T. Aaltonen, J. Adelman, T. Akimoto, B. Alvarez Gonzalez, S. Ameriow, et al.. Measurement of W-Boson Helicity Fractions in Top-Quark Decays Using costheta. CDF Collaboration, 2008, 674, pp.160-167. ⟨10.1016/j.physletb.2009.02.040⟩. ⟨in2p3-00337139⟩

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