Calibration of the top quark mass for Monte-Carlo event generators

• Main Authors: Preisser, Moritz (Author), Butenschön, Mathias (Author), Dehnadi, Bahman (Author), Hoang, Andre (Author), Mateu, Vicent (Author), Stewart, Iain W. (Author)
• Format: Article
• Language: English
• Published: Sissa Medialab, 2021-11-03T14:56:44Z.
• Subjects: Article
• Online Access: Get fulltext

 © 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.