Abstract
For the analysis of various properties of the top quark, parameters like selection efficiency are taken from simulated event samples. These samples need several input parameters, like the top quark mass, the strength of initial and final state radiation or parton distribution functions. The presented results will depend on the choice of these input parameters. Therefore it is mandatory to determine a range of parameters which is consistent with current measurements and is able to determine the systematic uncertainty on the measurement result due to the input of certain parameters in the signal generation. In these proceedings the procedures used by the ATLAS experiment at the LHC are given.
Highlights
At the ATLAS experiment [1] at the LHC several modelling parameters were studied and their influence on the results of various measurements for top quarks were evaluated
For any analysis the largest discrepancy observed for these three generators is taken as a systematic uncertainty
Typical discrepancies are 5 % [7] for MC@NLO compared to Powheg and up to 10 % for MC@NLO compared to Alpgen
Summary
At the ATLAS experiment [1] at the LHC several modelling parameters were studied and their influence on the results of various measurements for top quarks were evaluated. For any analysis the largest discrepancy observed for these three generators is taken as a systematic uncertainty. In this analysis events are vetoed if they contain in addition to the jets from the top quark pair production decay an additional jet with transverse momentum above a threshold Q0 in a central rapidity interval. Discrepancies of several percent are observed between the different generators but all are in agreement with the data within the measurement uncertainties
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