Measurement of tau polarization in W->taunu decays with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV

The ATLAS Collaboration;Aad, Georges;Jez, Pavel;Tanasijczuk, Andres Jorge;et.al.
(2012) European Physical Journal C. Particles and Fields — Vol. 72, p. 2062 (2012)

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Abstract
In this paper, a measurement of tau polarization in W->taunu decays is presented. It is measured from the energies of the decay products in hadronic tau decays with a single final state charged particle. The data, corresponding to an integrated luminosity of 24 pb^-1, were collected by the ATLAS experiment at the Large Hadron Collider in 2010. The measured value of the tau polarization is Ptau = -1.06 +/- 0.04 (stat) + 0.05 (syst) - 0.07 (syst), in agreement with the Standard Model prediction, and is consistent with a physically allowed 95% CL interval [-1,-0.91]. Measurements of tau polarization have not previously been made at hadron colliders.
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The ATLAS Collaboration, Aad, G., Jez, P., Tanasijczuk, A. J., & et al. (2012). Measurement of tau polarization in W->taunu decays with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV. European Physical Journal C. Particles and Fields, 72, 2062. https://doi.org/10.1140/epjc/s10052-012-2062-6 (Original work published 2012)