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

Author(s)

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

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.

Organisation(s)

Particle Physics, Research Platform Erwin Schrödinger International Institute for Mathematics and Physics

External organisation(s)

Massachusetts Institute of Technology, Universität Hamburg, Universität Siegen, Universidad Autónoma de Madrid

Journal

Proceedings of Science (PoS)

Volume

282

No. of pages

8

DOI

https://doi.org/10.22323/1.282.0698

Publication date

04-2017

Austrian Fields of Science 2012

103012 High energy physics

Portal url

https://ucris.univie.ac.at/portal/en/publications/calibration-of-the-top-quark-mass-for-montecarlo-event-generators(4ace5945-70bd-460c-9243-7649a4e927a5).html