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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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Article number2062
<mark>Journal publication date</mark>07/2012
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number7
Volume72
Number of pages21
Publication statusPublished
Original languageEnglish

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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This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.