Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 111: Experimentelle Methoden 4 (Rekonstruktion)

T 111.1: Vortrag

Donnerstag, 30. März 2017, 16:45–17:00, JUR 253

Identification of Hadronically Decaying Tau Leptons at the ATLAS experiment — •Christopher Deutsch, William Davey, and Jochen Dingfelder — Physikalisches Institut, Universität Bonn

The tau lepton is the heaviest lepton in the Standard Model and an important probe of physics at high energy scales, such as Higgs physics and physics beyond the Standard Model. Hadronic decays make up approximately two-thirds of the total branching ratio of tau decays and play an important part in the physics programme of the ATLAS experiment.

Jets originating from quarks or gluons, which are more abundant than tau leptons due to the large multijet production cross section at the LHC, can mimic hadronic tau decays. At the ATLAS experiment an identification algorithm based on multivariate methods utilizing track and shower shape variables is used to discriminate hadronically decaying taus from jets.

This talk is concerned with the latest developments of the tau identification for ATLAS Run II data including measures to improve the rejection of jets while maintaining a robust algorithm suitable for different physics analyses. The focus lies on an improved input variable selection and a systematic investigation and optimization of multivariate methods for tau identification.