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T: Fachverband Teilchenphysik
T 37: Top-Quark: Eigenschaften 1
T 37.2: Talk
Monday, February 27, 2012, 17:00–17:15, ZHG 105
Measurement of the Top Quark Mass with the ATLAS Experiment Using a 1-D Template Method — Giorgio Cortiana2, •Stefan Guindon1, Kevin Kroeninger1, Richard Nisius2, Arnulf Quadt1, and Elizaveta Shabalina1 — 1II Physikalisches Institut, Georg-August-Universität Göttingen — 2Max-Planck-Institut für Physik, (Werner-Heisenberg-Institut), München
A top quark mass measurement in the lepton + jets channel using 1 fb−1 of data collected in the first half of the 2011 ATLAS experiment run will be presented. The measurement uses an explicit reconstruction of the tt decay. The reconstructed top and W masses are used to form a stable ratio against fluctuations in the jet energy scale (JES). The ratio is referred to as the R32 estimator. Using the dependence on the top mass, a template fit is performed to data in both, the e+jets and µ + jets channels, separately. Relevant systematics are also studied in order to quantify the uncertainty on the mass measurement.