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Measurement of polarisation in decays in proton-proton collisions at TeV with the ATLAS detector
1Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco.
Abstract:
This paper presents a measurement of the polarisation of leptons produced in decays which is performed with a dataset of proton-proton collisions at TeV, corresponding to an integrated luminosity of 20.2 fb recorded with the ATLAS detector at the LHC in 2012. The decays are reconstructed from a hadronically decaying lepton with a single charged particle in the final state, accompanied by a lepton that decays leptonically. The polarisation is inferred from the relative fraction of energy carried by charged and neutral hadrons in the hadronic decays. The polarisation is measured in a fiducial region that corresponds to the kinematic region accessible to this analysis. The polarisation extracted over the full phase space within the mass range of 66 116 GeV is found to be . It is in agreement with the Standard Model prediction of , which is obtained from the ALPGEN event generator interfaced with the PYTHIA 6 parton shower modelling and the TAUOLA decay library.
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