München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 34: Top-Physik 2

T 34.8: Talk

Tuesday, March 10, 2009, 18:30–18:45, M018

b tagging performance studies for various systematic misalignment scenarios with ATLAS — Siegfried Bethke, Giorgio Cortiana, Petra Haefner, Roland Härtel, Stefan Kluth, Anna Macchiolo, Richard Nisius, •Sophio Pataraia, Jochen Schieck, and Philipp Weigell — Max-Planck-Institut für Physik, München

Identification of jets which originate from b quarks is important for most of the physics program of ATLAS, i.e. for a precise measurement of the top quark sector and for searches for physics beyond the Standard Model.

We studied the performance of the existing b tagging algorithms of ATLAS in terms of tagging efficiencies and light quark rejection using Monte Carlo simulated top-antitop pair production events.

We investigated the expected b tagging performance for the early data taking period. We performed systematic studies of heavy flavour tagging performance for various Inner Detector misalignment configurations and variations of the b tagging calibration procedure.