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Abstract: (PoS)
The most precise top quark mass measurements use kinematic reconstruction methods, deter- mining the top mass parameter of a Monte Carlo event generator, m MC t . Due to the complicated interplay of hadronization and parton shower dynamics in Monte Carlo event generators, relating m MC t to field theory masses is a non-trivial task. In this talk we present a calibration procedure to determine this relation using hadron level QCD predictions for 2-Jettiness in e + e − annihilation, an observable which has kinematic top mass sensitivity and has a close relation to the invariant mass of the particles coming from the top decay. The theoretical ingredients of the QCD prediction are explained. Fitting e + e − 2-Jettiness calculations at NLL/NNLL order to P YTHIA 8.205, we find that m MC t agrees with the MSR mass at the scale 1 GeV within uncertainties, m MC t ' m MSR t , 1 GeV , but differs from the pole mass by 900/600 MeV.
  • top: mass
  • mass: pole
  • top: decay
  • electron positron: annihilation
  • parton: showers
  • hadronization
  • Monte Carlo
  • quantum chromodynamics
  • higher-order: 1
  • higher-order: 2