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

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

Publications: Contribution to journalMeeting abstract/Conference paper

Abstract

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. Due to the complicated interplay of hadronization and parton shower dynamics in Monte Carlo event generators, relating m t 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 m t MC agrees with the MSR mass at the scale 1 GeV within uncertainties, m t MC ≃ m t MSR 1GeV, but differs from the pole mass by 900/600 MeV.

Original languageEnglish
Article number698
Number of pages8
JournalProceedings of Science (PoS)
Volume282
DOIs
Publication statusPublished - 19 Apr 2017
Event 38th International Conference on High Energy Physics (ICHEP2016) - Chicago, United States
Duration: 3 Aug 201610 Aug 2016

Austrian Fields of Science 2012

  • 103012 High energy physics

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