The relation between the top quark mass parameters of Monte-Carlo event generators and renormalized and well-defined Lagrangian masses is not very well understood and a subject of intense discussions in the community given that the current experimental uncertainties in direct top mass determinations is at the level of 300 MeV. A calibration framework has been developed to determine this relation numerically by using hadron level N2LL accurate theoretical predictions for e+e- to ttbar event shapes expressed in the pole or MSR mass. In this presentation I will talk about crucial improvements to this framework and provide a first look at observable universality and a preliminary comparison between the major Monte-Carlo event generators Pythia, Herwig and Sherpa.
Oliver Jin (Vienna): Top mass calibration for Monte-Carlo event generators
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