Dresden 2013 – scientific programme

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T: Fachverband Teilchenphysik

T 35: Top-Quarks 3

T 35.8: Talk

Monday, March 4, 2013, 18:30–18:45, HSZ-02

Application of the Matrix Element Method to top quark physics at ATLAS — •Maike Hansen, Philip Bechtle, Ian C. Brock, Klaus Desch, Petra Haefner, and Thomas Loddenkötter — University of Bonn

The matrix element method has proven to yield a very precise measurement of the top quark mass at Tevatron. It is designed to extract the maximum amount of information from each single measurement. The method is based on a likelihood maximization. A single likelihood function is taken as the probability that a measurement results from a certain process (i.e. a top quark decay) given a signal hypothesis and a set of parameters. The single event probabilities are then combined to one probability for the whole sample taking into account all possible permutations as well as all possible initial states and the detector resolution.

This method is highly promising in searches for new physics where we expect low statistics and therefore need a very precise measurement. Here we benefit from the fact that the full kinematic information is used. The application of this method in a top quark mass measurement as well as possible extensions to non standard model physics will be discussed. It is planned to apply this method in a search for tt-resonances.