Understand
Currently the most precise LHC measurements of the top quark mass are determinations of the top quark mass parameter of Monte-Carlo (MC) event generators reaching uncertainties of well below $1$ GeV.
- However, there is an additional theoretical problem when using the MC top mass $m_t^{\rm MC}$ as an input for theoretical predictions, because a rigorous relation of $m_t^{\rm MC}$ to a renormalized field theory mass is, at the very strict level, absent.
- In this talk I show how - nevertheless - some concrete statements on $m_t^{\rm MC}$ can be deduced assuming that the MC generator behaves like a rigorous first principles QCD calculator for the observables that are used for the analyses.
- I give simple conceptual arguments showing that in this context $m_t^{\rm MC}$ can be interpreted like the mass of a heavy-light top meson, and that there is a conversion relation to field theory top quark masses that requires a non-perturbative input.