Top quark mass calibration for Monte-Carlo event generators

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

doi:10.22323/1.265.0153

Abstract

The most precise top quark mass measurements use kinematic reconstruction methods, determining the top mass parameter of a Monte Carlo event generator, mMCt. Due to the complicated interplay of hadronization and parton shower dynamics in Monte Carlo event generators, relating mMCt 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 mMCt agrees with the MSR mass at the scale 1 GeV within uncertainties, mMCt ≃ mMSRt;1GeV, but differs from the pole mass by 900/600MeV.

Originalsprache	Englisch
Aufsatznummer	153
Fachzeitschrift	Proceedings of Science (PoS)
Jahrgang	265
DOIs	https://doi.org/10.22323/1.265.0153
Publikationsstatus	Veröffentlicht - 2016
Veranstaltung	XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2016) - Hamburg, Deutschland Dauer: 11 Apr. 2016 → 15 Apr. 2016 https://pos.sissa.it/265/

ÖFOS 2012

103034 Teilchenphysik
103012 Hochenergiephysik

Zugriff auf Dokument

10.22323/1.265.0153Lizenz: CC BY-NC-ND 4.0

Andere Dateien und Links

http://www.scopus.com/inward/record.url?scp=85006958996&partnerID=8YFLogxK

Zitationsweisen

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

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

year = "2016",

doi = "10.22323/1.265.0153",

language = "English",

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journal = "Proceedings of Science (PoS)",

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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 - 2016

Y1 - 2016

N2 - The most precise top quark mass measurements use kinematic reconstruction methods, determining the top mass parameter of a Monte Carlo event generator, mMCt. Due to the complicated interplay of hadronization and parton shower dynamics in Monte Carlo event generators, relating mMCt 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 mMCt agrees with the MSR mass at the scale 1 GeV within uncertainties, mMCt ≃ mMSRt;1GeV, but differs from the pole mass by 900/600MeV.

AB - The most precise top quark mass measurements use kinematic reconstruction methods, determining the top mass parameter of a Monte Carlo event generator, mMCt. Due to the complicated interplay of hadronization and parton shower dynamics in Monte Carlo event generators, relating mMCt 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 mMCt agrees with the MSR mass at the scale 1 GeV within uncertainties, mMCt ≃ mMSRt;1GeV, but differs from the pole mass by 900/600MeV.

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DO - 10.22323/1.265.0153

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SN - 1824-8039

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JO - Proceedings of Science (PoS)

JF - Proceedings of Science (PoS)

M1 - 153

T2 - XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2016)

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