Top quark mass calibration for Monte-Carlo event generators

Mathias Butenschoen, Bahman Dehnadi, André H. Hoang, Vicent Mateu, Moritz Preisser, Iain W. Stewart

The most precise top quark mass measurements use kinematic reconstruction methods, determining the top mass parameter of a Monte Carlo event generator, mt MC. Due to the complicated interplay of hadronization and parton shower dynamics in Monte Carlo event generators, relating mt MC 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 PYTHIA 8.205, we find that mt MC agrees with the MSR mass at the scale 1 GeV within uncertainties, mt MC ' mt MSR 1GeV, but differs from the pole mass by 900/600 MeV.

Particle Physics, Research Platform Erwin Schrödinger International Institute for Mathematics and Physics
External organisation(s)
Universität Hamburg, Universidad de Salamanca, Massachusetts Institute of Technology
Proceedings of Science (PoS)
No. of pages
Publication date
Peer reviewed
Austrian Fields of Science 2012
103034 Particle physics
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