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

Journal article published in 2016 by G. Zorzi, M. Zur Nedden, G. N. Taylor, W. Taylor, J. Wang, R. Wang, S. M. Wang, C. Via, H. Torre, J. B. Vivie De Regie, D. Volpe, Z. Yang, M. A. B. Vale, A. Valle Wemans, D. Dzahini and other authors.
This paper is available in a repository.
This paper is available in a repository.

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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. ; Comment: 10 pages plus author list (25 pages total), 4 figures, 4 tables, revised author list, matches published EPJC version