Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/115138
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Type: Journal article
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
Author: Aaboud, M.
Aad, G.
Abbott, B.
Abdinov, O.
Abeloos, B.
Abidi, S.
AbouZeid, O.
Abraham, N.
Abramowicz, H.
Abreu, H.
Abreu, R.
Abulaiti, Y.
Acharya, B.
Adachi, S.
Adamczyk, L.
Adelman, J.
Adersberger, M.
Adye, T.
Affolder, A.
Afik, Y.
et al.
Citation: European Physical Journal C, 2018; 78(2):163-1-163-30
Publisher: Springer
Issue Date: 2018
ISSN: 1434-6044
1434-6052
Statement of
Responsibility: 
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.
Keywords: ATLAS Collaboration
Rights: © CERN for the benefit of the ATLAS collaboration 2018. This article is an open access publication
RMID: 0030083801
DOI: 10.1140/epjc/s10052-018-5619-1
Appears in Collections:Physics publications

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