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

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.

Originalsprache	Englisch
Aufsatznummer	189
Seitenumfang	6
Fachzeitschrift	Proceedings of Science (PoS)
Jahrgang	310
DOIs	https://doi.org/10.22323/1.310.0189
Publikationsstatus	Veröffentlicht - 1 Jan. 2017
Veranstaltung	17th International Conference on Hadron Spectroscopy and Structure, Hadron 2017 - Salamanca, Spanien Dauer: 25 Sept. 2017 → 29 Sept. 2017

ÖFOS 2012

103034 Teilchenphysik

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

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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

AN - SCOPUS:85052879950

SN - 1824-8039

VL - 310

JO - Proceedings of Science (PoS)

JF - Proceedings of Science (PoS)

M1 - 189

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

Y2 - 25 September 2017 through 29 September 2017

ER -

Top quark mass calibration for Monte-Carlo event generators

Abstract

ÖFOS 2012

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