München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 35: Top-Physik 3

T 35.5: Talk

Wednesday, March 11, 2009, 17:50–18:05, M018

Top quark pair production using topological variables at the ATLAS experiment at the LHC — •Adam Roe, Anna Henrichs, Ingo Krebs, Kevin Kröninger, Jörg Meyer, Su-Jung Park, Arnulf Quadt, Daniel Schiepel und Elizaveta Shabalina — II. Physikalisches Institut, Georg-August-Universität Göttingen, Deutschland.

Analyzing the properties of the top quark is an essential step in the ATLAS experiment at CERN’s LHC. In the long run, top physics is of extreme importance at the LHC because it provides precision tests of the Standard Model as well as sensitivity to physics beyond the Standard Model. While the ATLAS experiment is expected to see top-antitop (tt) pairs produced at an extraordinary rate, analysis will still be difficult. This is especially true at startup. One of the first quantities to be measured is the tt production cross section. This requires event selection, where the main backgrounds to tt are the W+jets channel and the QCD multi-jet background. In early running, the b-tagging algorithms, which are otherwise an extremely helpful tool for selecting top quark events, will not yet be reliable and event selection will therefore rely heavily upon topological variables. A first study of tt production cross section based on topological variables is thus presented here.