Top quark mass calibration for Monte-Carlo event generators

Autor(en)
Mathias Butenschoen, Bahman Dehnadi, André H. Hoang, Vicent Mateu, Moritz Preisser, Iain W. Stewart
Abstrakt

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.

Organisation(en)
Teilchenphysik, Forschungsplattform Internationales Erwin Schrödinger Institut für Mathematik und Physik
Externe Organisation(en)
Universität Hamburg, Universidad de Salamanca, Massachusetts Institute of Technology
Journal
Proceedings of Science (PoS)
Band
310
Anzahl der Seiten
6
DOI
https://doi.org/10.22323/1.310.0189
Publikationsdatum
01-2017
Peer-reviewed
Ja
ÖFOS 2012
103034 Teilchenphysik
ASJC Scopus Sachgebiete
General
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/top-quark-mass-calibration-for-montecarlo-event-generators(861df4fd-a486-4835-a1ed-1ce42e400e26).html