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T: Fachverband Teilchenphysik

T 36: Top-Physik 4

T 36.4: Vortrag

Donnerstag, 12. März 2009, 17:30–17:45, M018

Template Method for an early Top Mass Measurement in the tt → lepton+jets Channel with ATLAS Data — •Giorgio Cortiana, Andrea Bangert, Siegfried Bethke, Tobias Göttfert, Petra Haefner, Roland Härtel, Stefan Kluth, Anna Macchiolo, Richard Nisius, Sophio Pataraia, Jochen Schieck, and Philipp Weigell — Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 München, Germany

We present the prospects for a top mass measurement via the template method in the tt→ lepton+jets channel with first ATLAS data.

The template method uses probability density functions (PDFs) for signal and background in an un-binned likelihood fit to the reconstructed hadronic top mass to infer the top-quark mass, m_top. In this work, event yields and kinematical distributions are obtained from simulated Monte Carlo samples of the tt, single top and W+jets processes, for a proton-proton center-of-mass energy of 10 TeV. PDFs are determined for signal as a function of m_top, and for background events by fitting a functional form from the corresponding reconstructed hadronic top mass distributions (templates). The procedure is calibrated using Monte Carlo tt simulated events, generated at different m_top values around the present experimental measurement.

Simulated data ensembles (pseudo-experiments) are explored to check the fitting procedure for possible systematic biases, and to estimate the expected statistical and systematic uncertainty on the top mass measurement under different integrated luminosity assumptions.