Measurement of τ polarisation in Z/γ∗→ττ decays in proton–proton collisions at √s=8 TeV with the ATLAS detector

, The ATLAS collaboration (2018) Measurement of τ polarisation in Z/γ∗→ττ decays in proton–proton collisions at √s=8 TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, 78 (2). ISSN 1434-6044

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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/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.

Item Type:
Journal Article
Journal or Publication Title:
European Physical Journal C: Particles and Fields
Additional Information:
EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
ID Code:
124152
Deposited By:
Deposited On:
21 Mar 2018 11:04
Refereed?:
Yes
Published?:
Published
Last Modified:
21 Nov 2020 06:18