Aaboud, M;
Aad, G;
Abbott, B;
Abdinov, O;
Abeloos, B;
Abidi, SH;
AbouZeid, OS;
... Aperio Bella, L; + view all
(2018)
Measurement of τ polarisation in Z/γ ∗ → τ τ decays in
proton–proton collisions at √s = 8 TeV with the ATLAS detector.
European Physical Journal C
, 78
(2)
, Article 163. 10.1140/epjc/s10052-018-5619-1.
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Abstract
This paper presents a measurement of the polarisation of τ leptons produced in Z/ γ ∗ → ττ decays which is performed with a dataset of proton—proton collisions at s=8 TeV, corresponding to an integrated luminosity of 20.2 fb - 1 recorded with the ATLAS detector at the LHC in 2012. The Z/ γ ∗ → ττ decays are reconstructed from a hadronically decaying τ lepton with a single charged particle in the final state, accompanied by a τ lepton that decays leptonically. The τ polarisation is inferred from the relative fraction of energy carried by charged and neutral hadrons in the hadronic τ decays. The polarisation is measured in a fiducial region that corresponds to the kinematic region accessible to this analysis. The τ polarisation extracted over the full phase space within the Z/ γ ∗ mass range of 66 < mZ/ 116 GeV is found to be P τ = - 0.14 ± 0.02 (stat) ± 0.04 (syst). It is in agreement with the Standard Model prediction of P τ = - 0.1517 ± 0.0019 , which is obtained from the ALPGEN event generator interfaced with the PYTHIA 6 parton shower modelling and the TAUOLA τ decay library.
| Type: | Article |
|---|---|
| Title: | Measurement of τ polarisation in Z/γ ∗ → τ τ decays in proton–proton collisions at √s = 8 TeV with the ATLAS detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1140/epjc/s10052-018-5619-1 |
| Publisher version: | http://doi.org/10.1140/epjc/s10052-018-5619-1 |
| Language: | English |
| Additional information: | © 2018, CERN for the benefit of the ATLAS collaboration. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10044886 |
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