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|Title:||Measurement of τ polarisation in Ζ/γ* → ττ decays in proton–proton collisions at √s = 8 TeV with the ATLAS detector|
|Other Titles:||Measurement of tau polarisation in Zeta/gamma* -> tau tau decays in proton-proton collisions at root s = 8 TeV with the ATLAS detector|
|Citation:||European Physical Journal C, 2018; 78(2):163-1-163-30|
|M. Aaboud ... D. Duvnjak ... P. Jackson ... L. Lee ... A. Petridis ... M.J. White ... [et al.] (The ATLAS Collaboration)|
|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/γ* < 116 GeV is found to be Pτ = −0.14±0.02(stat)±0.04(syst). It is in agreement with the Standard Model prediction of Pτ = −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.|
|Rights:||© CERN for the benefit of the ATLAS collaboration 2018. This article is an open access publication|
|Appears in Collections:||Physics publications|
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