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QCD Coherence and the Top Quark Asymmetry

Coherent QCD radiation in the hadroproduction of top quark pairs leads to a forward--backward asymmetry that grows more negative with increasing transverse momentum of the pair. This feature is present in Monte Carlo event generators with coherent parton showering, even though the production process...

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Detalles Bibliográficos
Autores principales: Skands, Peter, Webber, Bryan, Winter, Jan
Lenguaje:eng
Publicado: 2012
Materias:
Acceso en línea:https://dx.doi.org/10.1007/JHEP07(2012)151
http://cds.cern.ch/record/1447019
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author Skands, Peter
Webber, Bryan
Winter, Jan
author_facet Skands, Peter
Webber, Bryan
Winter, Jan
author_sort Skands, Peter
collection CERN
description Coherent QCD radiation in the hadroproduction of top quark pairs leads to a forward--backward asymmetry that grows more negative with increasing transverse momentum of the pair. This feature is present in Monte Carlo event generators with coherent parton showering, even though the production process is treated at leading order and has no intrinsic asymmetry before showering. In addition, depending on the treatment of recoils, showering can produce a positive contribution to the inclusive asymmetry. We explain the origin of these features, compare them in fixed-order calculations and the Herwig++, Pythia and Sherpa event generators, and discuss their implications.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2012
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spelling cern-14470192019-09-30T06:29:59Zdoi:10.1007/JHEP07(2012)151http://cds.cern.ch/record/1447019engSkands, PeterWebber, BryanWinter, JanQCD Coherence and the Top Quark AsymmetryParticle Physics - PhenomenologyCoherent QCD radiation in the hadroproduction of top quark pairs leads to a forward--backward asymmetry that grows more negative with increasing transverse momentum of the pair. This feature is present in Monte Carlo event generators with coherent parton showering, even though the production process is treated at leading order and has no intrinsic asymmetry before showering. In addition, depending on the treatment of recoils, showering can produce a positive contribution to the inclusive asymmetry. We explain the origin of these features, compare them in fixed-order calculations and the Herwig++, Pythia and Sherpa event generators, and discuss their implications.arXiv:1205.1466CAVENDISH-HEP-12-07CERN-PH-TH-2012-099MCNET-12-04oai:cds.cern.ch:14470192012-05-08
spellingShingle Particle Physics - Phenomenology
Skands, Peter
Webber, Bryan
Winter, Jan
QCD Coherence and the Top Quark Asymmetry
title QCD Coherence and the Top Quark Asymmetry
title_full QCD Coherence and the Top Quark Asymmetry
title_fullStr QCD Coherence and the Top Quark Asymmetry
title_full_unstemmed QCD Coherence and the Top Quark Asymmetry
title_short QCD Coherence and the Top Quark Asymmetry
title_sort qcd coherence and the top quark asymmetry
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1007/JHEP07(2012)151
http://cds.cern.ch/record/1447019
work_keys_str_mv AT skandspeter qcdcoherenceandthetopquarkasymmetry
AT webberbryan qcdcoherenceandthetopquarkasymmetry
AT winterjan qcdcoherenceandthetopquarkasymmetry