Mainz 2014 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 37: Experimentelle Methoden 1

T 37.4: Vortrag

Montag, 24. März 2014, 17:30–17:45, P103

Improving the reconstruction of neutral pions in tau decays using the strip layer of the ATLAS detector — •Stephanie Yuen, Benedict Tobias Winter, William Davey, and Jochen Dingfelder — Physikalisches Institut, Universität Bonn

The reconstruction of hadronically decaying tau leptons plays an important role in the physics goals of the LHC. At ATLAS, the tau lepton is the only lepton for which polarization measurements are possible. A promising decay channel for these measurements is the τ→ ρ(π^±π⁰)ν_τ decay mode, which suffers from background contributions from the τ→ a₁(π^±π⁰π⁰) ν_τ decay. An algorithm is proposed as an addition to the existing tau reconstruction software at ATLAS to distinguish between ρ and a₁ decays by searching for individual photon showers in the high-granularity strip layer of the ATLAS electromagnetic calorimeter. An additional application of the algorithm is proposed to identify π^± energy deposits in the strip layer to better distinguish them from π⁰ energy deposits for use in the hadronic energy subtraction performed in the π⁰ reconstruction algorithm for tau decays.