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Measurement of τ polarization in W→τν decays with the ATLAS detector in pp collisions at √s=7 TeV
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The ATLAS Collaboration (Including: Farrington, Sinead). (2012) Measurement of τ polarization in W→τν decays with the ATLAS detector in pp collisions at √s=7 TeV. European Physical Journal C, Volume 72 (Number 7). Article number 2062 . doi:10.1140/epjc/s10052-012-2062-6 ISSN 1434-6044.
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WRAP_ATLAS_art%3A10.1140%2Fepjc%2Fs10052-012-2062-6.pdf - Published Version Available under License Creative Commons Attribution. Download (1689Kb) | Preview |
Official URL: http://dx.doi.org/10.1140/epjc/s10052-012-2062-6
Abstract
In this paper, a measurement of τ polarization in W→τν decays is presented. It is measured from the energies of the decay products in hadronic τ 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 τ polarization is Pτ=−1.06±0.04 (stat)+0.05−0.07 (syst), in agreement with the Standard Model prediction, and is consistent with a physically allowed 95 % CL interval [−1,−0.91]. Measurements of τ polarization have not previously been made at hadron colliders.
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