Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 111: Experimentelle Methoden 4 (Rekonstruktion)

T 111.5: Talk

Thursday, March 30, 2017, 17:45–18:00, JUR 253

Recent developments in reconstruction of neutral pions in tau decays at ATLAS — •Simon Blanke, Benedict Winter, William Davey, and Jochen Dingfelder — Physikalisches Institut Universität Bonn

Hadronic decays of tau leptons are intensively studied at the LHC, since they are important signatures e.g. of Higgs boson decays or Supersymmetry. Dedicated techniques have been developed to reconstruct the hadronic decay products in tau decays and are being commissioned for use in physics analysis. They will help improving the 4-momentum reconstruction by using particle flow methods. They will also improve the sensitivity to tau polarization, which is beneficial for physics analysis to study the properties of e.g. the Higgs boson or potentially other new particles. Two-thirds of the hadronic tau decays involve neutral pions. Thus the reconstruction and identification of neutral pions is of key importance for the tau decay reconstruction.

The neutral pion reconstruction algorithm determines the energy deposited by charged hadrons in the electromagnetic calorimeter and subtracts it. The remaining neutral pion candidate clusters are identified by utilizing variables sensitive to their shape in the calorimeter.