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Colour correlations and multiplicities in top events

In events of the type e+ e- -> t tbar -> b W+ bbar W-, particle production could depend in a non-trivial way on the kinematics of the process. Energetic perturbative gluon radiation can be generated (when kinematically allowed) by the original t tbar system and by the t -> b W+ and tbar -&g...

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Detalles Bibliográficos
Autores principales: Khoze, V A, Sjöstrand, Torbjörn
Lenguaje:eng
Publicado: 1994
Materias:
Acceso en línea:https://dx.doi.org/10.1016/0370-2693(94)91506-7
http://cds.cern.ch/record/261131
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author Khoze, V A
Sjöstrand, Torbjörn
author_facet Khoze, V A
Sjöstrand, Torbjörn
author_sort Khoze, V A
collection CERN
description In events of the type e+ e- -> t tbar -> b W+ bbar W-, particle production could depend in a non-trivial way on the kinematics of the process. Energetic perturbative gluon radiation can be generated (when kinematically allowed) by the original t tbar system and by the t -> b W+ and tbar -> bbar W- decays, with negligible interference between the production and decay stages and between the t and tbar decays. Soft perturbative gluon emission and non-perturbative fragmentation does introduce a correlation, however. To illustrate the size of these effects, we study the multiplicity as a function of the angle between the b and bbar jets, close to the t tbar threshold. Also potential uncertainties in top mass determinations are briefly addressed.
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institution Organización Europea para la Investigación Nuclear
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spelling cern-2611312019-09-30T06:29:59Zdoi:10.1016/0370-2693(94)91506-7http://cds.cern.ch/record/261131engKhoze, V ASjöstrand, TorbjörnColour correlations and multiplicities in top eventsParticle Physics - PhenomenologyIn events of the type e+ e- -> t tbar -> b W+ bbar W-, particle production could depend in a non-trivial way on the kinematics of the process. Energetic perturbative gluon radiation can be generated (when kinematically allowed) by the original t tbar system and by the t -> b W+ and tbar -> bbar W- decays, with negligible interference between the production and decay stages and between the t and tbar decays. Soft perturbative gluon emission and non-perturbative fragmentation does introduce a correlation, however. To illustrate the size of these effects, we study the multiplicity as a function of the angle between the b and bbar jets, close to the t tbar threshold. Also potential uncertainties in top mass determinations are briefly addressed.hep-ph/9403394CERN-TH-7199-94DTP-94-18oai:cds.cern.ch:2611311994
spellingShingle Particle Physics - Phenomenology
Khoze, V A
Sjöstrand, Torbjörn
Colour correlations and multiplicities in top events
title Colour correlations and multiplicities in top events
title_full Colour correlations and multiplicities in top events
title_fullStr Colour correlations and multiplicities in top events
title_full_unstemmed Colour correlations and multiplicities in top events
title_short Colour correlations and multiplicities in top events
title_sort colour correlations and multiplicities in top events
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/0370-2693(94)91506-7
http://cds.cern.ch/record/261131
work_keys_str_mv AT khozeva colourcorrelationsandmultiplicitiesintopevents
AT sjostrandtorbjorn colourcorrelationsandmultiplicitiesintopevents