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Non-perturbative QCD Effects and the Top Mass at the Tevatron

The modelling of non-perturbative effects is an important part of modern collider physics simulations. In hadron collisions there is some indication that the modelling of the interactions of the beam remnants, the underlying event, may require non-trivial colour reconnection effects to be present. W...

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Detalles Bibliográficos
Autores principales: Wicke, Daniel, Skands, Peter Z.
Lenguaje:eng
Publicado: 2008
Materias:
Acceso en línea:https://dx.doi.org/10.1393/ncb/i2009-10749-y
http://cds.cern.ch/record/1116452
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author Wicke, Daniel
Skands, Peter Z.
author_facet Wicke, Daniel
Skands, Peter Z.
author_sort Wicke, Daniel
collection CERN
description The modelling of non-perturbative effects is an important part of modern collider physics simulations. In hadron collisions there is some indication that the modelling of the interactions of the beam remnants, the underlying event, may require non-trivial colour reconnection effects to be present. We recently introduced a universally applicable toy model of such reconnections, based on hadronising strings. This model, which has one free parameter, has been implemented in the Pythia event generator. We then considered several parameter sets (`tunes'), constrained by fits to Tevatron minimum-bias data, and determined the sensitivity of a simplified top mass analysis to these effects, in exclusive semi-leptonic top events at the Tevatron. A first attempt at isolating the genuine non-perturbative effects gave an estimate of order +-0.5GeV from non-perturbative uncertainties. The results presented here are an update to the original study and include recent bug fixes of Pythia that influenced the tunings investigated.
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spelling cern-11164522023-03-12T04:44:25Zdoi:10.1393/ncb/i2009-10749-yhttp://cds.cern.ch/record/1116452engWicke, DanielSkands, Peter Z.Non-perturbative QCD Effects and the Top Mass at the Tevatronhep-phThe modelling of non-perturbative effects is an important part of modern collider physics simulations. In hadron collisions there is some indication that the modelling of the interactions of the beam remnants, the underlying event, may require non-trivial colour reconnection effects to be present. We recently introduced a universally applicable toy model of such reconnections, based on hadronising strings. This model, which has one free parameter, has been implemented in the Pythia event generator. We then considered several parameter sets (`tunes'), constrained by fits to Tevatron minimum-bias data, and determined the sensitivity of a simplified top mass analysis to these effects, in exclusive semi-leptonic top events at the Tevatron. A first attempt at isolating the genuine non-perturbative effects gave an estimate of order +-0.5GeV from non-perturbative uncertainties. The results presented here are an update to the original study and include recent bug fixes of Pythia that influenced the tunings investigated.The modelling of non-perturbative effects is an important part of modern collider physics simulations. In hadron collisions there is some indication that the modelling of the interactions of the beam remnants, the underlying event, may require non-trivial colour reconnection effects to be present. We recently introduced a universally applicable toy model of such reconnections, based on hadronising strings. This model, which has one free parameter, has been implemented in the Pythia event generator. We then considered several parameter sets (`tunes'), constrained by fits to Tevatron minimum-bias data, and determined the sensitivity of a simplified top mass analysis to these effects, in exclusive semi-leptonic top events at the Tevatron. A first attempt at isolating the genuine non-perturbative effects gave an estimate of order +-0.5GeV from non-perturbative uncertainties. The results presented here are an update to the original study and include recent bug fixes of Pythia that influenced the tunings investigated.arXiv:0807.3248FERMILAB-CONF-08-509-TMCNET-08-06oai:cds.cern.ch:11164522008-07-22
spellingShingle hep-ph
Wicke, Daniel
Skands, Peter Z.
Non-perturbative QCD Effects and the Top Mass at the Tevatron
title Non-perturbative QCD Effects and the Top Mass at the Tevatron
title_full Non-perturbative QCD Effects and the Top Mass at the Tevatron
title_fullStr Non-perturbative QCD Effects and the Top Mass at the Tevatron
title_full_unstemmed Non-perturbative QCD Effects and the Top Mass at the Tevatron
title_short Non-perturbative QCD Effects and the Top Mass at the Tevatron
title_sort non-perturbative qcd effects and the top mass at the tevatron
topic hep-ph
url https://dx.doi.org/10.1393/ncb/i2009-10749-y
http://cds.cern.ch/record/1116452
work_keys_str_mv AT wickedaniel nonperturbativeqcdeffectsandthetopmassatthetevatron
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