Calibration of the top quark mass for Monte-Carlo event generators
Author(s)
Butenschoen, Mathias; Dehnadi, Bahman; Hoang, André H.; Mateu, Vicent; Preisser, Moritz; Stewart, Iain W; ... Show more Show less
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© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). The most precise top quark mass measurements use kinematic reconstruction methods, determining the top mass parameter of a Monte Carlo event generator, mtMC. Due to the complicated interplay of hadronization and parton shower dynamics in Monte Carlo event generators, relating mtMC 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 mtMC agrees with the MSR mass at the scale 1 GeV within uncertainties, mtMC ≃ mtMSR1GeV, but differs from the pole mass by 900/600 MeV.
Date issued
2016-08Department
Massachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of PhysicsJournal
Proceeding of science
Publisher
Sissa Medialab
Citation
Preisser, Moritz, Butenschön, Mathias, Dehnadi, Bahman, Hoang, Andre, Mateu, Vicent et al. 2017. "Calibration of the top quark mass for Monte-Carlo event generators."
Version: Final published version
ISSN
1824-8039