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 P τ = −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 STYLE
Aad, G., Abbott, B., Abdallah, J., Khalek, S. A., Abdelalim, A. A., Abdesselam, A., … Zwalinski, L. (2012). Measurement of τ polarization in W →τν decays with the ATLAS detector in pp collisions at √s = 7 TeV. European Physical Journal C, 72(7). https://doi.org/10.1140/epjc/s10052-012-2062-6
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