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Scientific article
English

Measurement of τ polarization in W -> τν decays with the ATLAS detector in pp collisions at √s=7 TeV

ContributorsATLAS Collaboration
Published inEuropean physical journal. C, Particles and fields, vol. 72, no. 2062, 21
Publication date2012
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.

Citation (ISO format)
ATLAS Collaboration. Measurement of <em>τ</em> polarization in <em>W -&gt; τν</em> decays with the ATLAS detector in <em>pp</em> collisions at √s=7 TeV. In: European physical journal. C, Particles and fields, 2012, vol. 72, n° 2062, p. 21. doi: 10.1140/epjc/s10052-012-2062-6
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ISSN of the journal1434-6044
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