München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 36: Top-Physik 4

T 36.7: Talk

Thursday, March 12, 2009, 18:15–18:30, M018

Measurement of the top-quark mass using the decay length method at ATLAS — •Jörg Walbersloh, Claus Gößling, and Reiner Klingenberg — Exp. Physik IV, TU Dortmund

The precision of measurements of the top quark mass with methods which rely on energy measurements is limited due to the Jet Energy Scale. We present a method that relies basically on tracking and has complementary uncertainties. This so-called Decay-Length-Method correlates the mean transverse decay length of B-Hadrons originating from top quarks to the mass of the initial top quark. This talk discusses the application the method for the semileptonic decay channel of tt-Events at the ATLAS detector and presents an estimate for uncertainties based on MonteCarlo simulations.