Top quark mass calibration for Monte-Carlo event generators

Mathias Butenschoen; Bahman Dehnadi; André H. Hoang; Vicent Mateu; Moritz Preisser; Iain W. Stewart

doi:10.22323/1.310.0189

Top quark mass calibration for Monte-Carlo event generators

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

Publications: Contribution to journal › Meeting abstract/Conference paper › Peer Reviewed

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 language	English
Article number	189
Number of pages	6
Journal	Proceedings of Science (PoS)
Volume	310
DOIs	https://doi.org/10.22323/1.310.0189
Publication status	Published - 1 Jan 2017
Event	17th International Conference on Hadron Spectroscopy and Structure, Hadron 2017 - Salamanca, Spain Duration: 25 Sept 2017 → 29 Sept 2017

Austrian Fields of Science 2012

103034 Particle physics

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10.22323/1.310.0189Licence: CC BY-NC-ND 4.0

Cite this

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title = "Top quark mass calibration for Monte-Carlo event generators",

abstract = "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.",

author = "Mathias Butenschoen and Bahman Dehnadi and Hoang, {Andr{\'e} H.} and Vicent Mateu and Moritz Preisser and Stewart, {Iain W.}",

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T1 - Top quark mass calibration for Monte-Carlo event generators

AU - Butenschoen, Mathias

AU - Dehnadi, Bahman

AU - Hoang, André H.

AU - Mateu, Vicent

AU - Preisser, Moritz

AU - Stewart, Iain W.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - 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.

AB - 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.

U2 - 10.22323/1.310.0189

DO - 10.22323/1.310.0189

M3 - Meeting abstract/Conference paper

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T2 - 17th International Conference on Hadron Spectroscopy and Structure, Hadron 2017

Y2 - 25 September 2017 through 29 September 2017

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