Top Quark Mass Calibration for Monte Carlo Event Generators

The most precise top quark mass measurements use kinematic reconstruction methods, determining the top mass parameter of a Monte Carlo event generator m(t)(MC). Because of hadronization and parton-shower dynamics, relating m(t)(MC) to a field theory mass is difficult. We present a calibration procedure to determine this relation using hadron level QCD predictions for observables with kinematic mass sensitivity. Fitting e(+)e(-) 2-jettiness calculations at next-to-leading-logarithmic and next-to-next-to-leading-logarithmic order to PYTHIA 8.205, m(t)(MC) differs from the pole mass by 900 600 MeV, respectively, and agrees with the MSR mass within uncertainties, m(t)(MC) similar or equal to m(t,1)(MSR)GeV.