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T: Fachverband Teilchenphysik

T 111: Experimentelle Methoden 4 (Rekonstruktion)

T 111.2: Vortrag

Donnerstag, 30. März 2017, 17:00–17:15, JUR 253

Latest status of the tau lepton decay mode classification at ATLAS — Philip Bechtle, Klaus Desch, •Lara Schildgen, and Peter Wagner — University of Bonn

Due to its short lifetime, the tau lepton decays before reaching the detectors and can only be reconstructed by its decay products. For Run II, one integral part of the particle flow based tau reconstruction in ATLAS will be the decay mode classification algorithm PanTau.

The tau decay mode classification algorithm PanTau exploits information from the topology of the reconstructed tau decay products. It is based on particle flow techniques which combine the track measurements of charged tau decay products in the tracking detectors with the energy information from the calorimeters to provide reconstructed π⁰ candidates. Decay mode specific discriminating variables are constructed which are exploited in a Boosted Decision Tree based algorithm. Using this method, PanTau allows for a classification of the individual tau decay modes. Taking into accout the additional information on the tau decay mode, the tau energy resolution and spatial resolution are significantly improved.

The talk summarizes the status of the PanTau development and presents the tau reconstruction performance using the latest algorithm tuning.