Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 58: Elektroschwache Wechselwirkung (Experiment) I
T 58.7: Talk
Tuesday, March 1, 2016, 18:15–18:30, VMP8 SR 206
Measurement of the tau polarization in Z → τ τ decays with the ATLAS detector — Philip Bechtle, Klaus Desch, •Lara Schildgen, and Peter Wagner — University of Bonn
This talk summarizes the status of the tau polarization analysis which represents the first measurement of the tau polarization in Z → τ τ decays at a hadron collider. In addition to the measurement of the tau polarization, the first ATLAS measurement of the effective Weinberg angle in third generation lepton coupling will be performed.
The presented analysis focuses on the decay process Z → τlep τhad in which the polarization of the hadronically decaying tau lepton is estimated from the energy asymmetry of the charged and neutral decay products.
The presentation emphasizes the understanding of polarization-sensitive observables using sideband and control distributions from data. The main focus is placed on the event selection and the background estimation including data driven methods for the estimation of multijet and W+jets backgrounds. Furthermore, the extraction of a systematic uncertainty on the shape of the data driven estimate of the W+jets background will be presented.
The presented analysis is based on data collected with the ATLAS detector in 2012 at a center of mass energy of √s = 8 TeV with an integrated luminosity of 20.3 fb−1.