2008

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

Aaltonen, T.

Understand

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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Tevatron Electroweak Working Group, “A Combination of CDF and DØ Results on the Mass of the Top Quark”, arXiv:0808.1089 [hep-ex]
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Cited in the paper.
In the CDF geometry, θ \theta is the polar angle with respect to the proton beam axis, and ϕ \phi is the azimuthal angle. The pseudorapidity is η ≡ − ln ⁡ ( tan ⁡ ( θ / 2 ) ) \eta\equiv-\ln(\tan(\theta/2)) . Detector | η | |\eta| is defined as the pseudorapidity of the jet calculated with respect to the center of the detector. The transverse momentum P T P_{\rm{T}} is the component of the momentum projected onto the plane perpendicular to the beam axis. The transverse energy E T E_{\rm{T}} of a shower or calorimeter tower is E sin ⁡ θ E\sin\theta , where E E is the energy deposited
Cited in the paper.
The missing E T E_{\rm{T}} ( ／ ⁡ E T → \vec{\mbox{$\raisebox{1.29167pt}{$\not$}E_{\rm T}$}} ) is defined by ／ ⁡ E T → = − Σ i E T i 𝐧 i \vec{\mbox{$\raisebox{1.29167pt}{$\not$}E_{\rm T}$}}=-\Sigma_{i}{{E_{\rm{T}}^{i}}{\bf{n}}_{i}} , where 𝐧 i {\bf{n}}_{i} is the unit vector in the azimuthal plane that points from the beamline to the i th i^{\rm{th}} calorimeter tower. We also define ／ ⁡ E T = | ／ ⁡ E T → | \mbox{$\raisebox{1.29167pt}{$\not$}E_{\rm T}$}=|\vec{\mbox{$\raisebox{1.29167pt}{$\not$}E_{\rm T}$}}|
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G. Corcella, I.G. Knowles, G. Marchesini, S. Moretti, K. Odagiri, P. Richardson, M.H. Seymour and B.R. Webber, hep-ph/0011363, hep-ph/0210213
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Closest in time.
T. Aaltonen et al
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V. M. Abazov et al
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Closest in time.

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