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A new method to determine the electroweak couplings of individual light flavours at LEP

A method is presented for determining the yields and properties of individual light quark flavours in $Z^0$ decays that is essentially free of detailed assumptions about hadronisation. The method uses an equation system with the number of events which are single and double tagged by high energy hadr...

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Detalles Bibliográficos
Autores principales: Letts, J, Mättig, P
Lenguaje:eng
Publicado: 1996
Materias:
Acceso en línea:https://dx.doi.org/10.1007/s002880050311
http://cds.cern.ch/record/306753
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author Letts, J
Mättig, P
author_facet Letts, J
Mättig, P
author_sort Letts, J
collection CERN
description A method is presented for determining the yields and properties of individual light quark flavours in $Z^0$ decays that is essentially free of detailed assumptions about hadronisation. The method uses an equation system with the number of events which are single and double tagged by high energy hadrons as inputs. In addition, SU(2) isospin symmetry and the flavour independence of QCD are used to derive general relations between hadron production from the various primary light quarks. Assuming the branching fractions $R_q$ of the $Z^0$ into down and strange quarks to be the same, five million hadronic $Z^0$ decays may allow a precisions of $\delta{(R_d=R_s)}/(R_d=R_s)\sim{0.05}$ and $\delta A_{FB}(d=s) \sim \delta A_{FB}(u) \sim{0.015}$ for the corresponding asymmetries. The method can be extended to include somewhat more model dependent symmetries of hadron production, which then allows the electroweak observables for each of the individual light quarks to be determined.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1996
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spelling cern-3067532019-09-30T06:29:59Zdoi:10.1007/s002880050311http://cds.cern.ch/record/306753engLetts, JMättig, PA new method to determine the electroweak couplings of individual light flavours at LEPParticle Physics - ExperimentA method is presented for determining the yields and properties of individual light quark flavours in $Z^0$ decays that is essentially free of detailed assumptions about hadronisation. The method uses an equation system with the number of events which are single and double tagged by high energy hadrons as inputs. In addition, SU(2) isospin symmetry and the flavour independence of QCD are used to derive general relations between hadron production from the various primary light quarks. Assuming the branching fractions $R_q$ of the $Z^0$ into down and strange quarks to be the same, five million hadronic $Z^0$ decays may allow a precisions of $\delta{(R_d=R_s)}/(R_d=R_s)\sim{0.05}$ and $\delta A_{FB}(d=s) \sim \delta A_{FB}(u) \sim{0.015}$ for the corresponding asymmetries. The method can be extended to include somewhat more model dependent symmetries of hadron production, which then allows the electroweak observables for each of the individual light quarks to be determined.CERN-OPEN-96-012DFUB-96-18oai:cds.cern.ch:3067531996-06-21
spellingShingle Particle Physics - Experiment
Letts, J
Mättig, P
A new method to determine the electroweak couplings of individual light flavours at LEP
title A new method to determine the electroweak couplings of individual light flavours at LEP
title_full A new method to determine the electroweak couplings of individual light flavours at LEP
title_fullStr A new method to determine the electroweak couplings of individual light flavours at LEP
title_full_unstemmed A new method to determine the electroweak couplings of individual light flavours at LEP
title_short A new method to determine the electroweak couplings of individual light flavours at LEP
title_sort new method to determine the electroweak couplings of individual light flavours at lep
topic Particle Physics - Experiment
url https://dx.doi.org/10.1007/s002880050311
http://cds.cern.ch/record/306753
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AT mattigp newmethodtodeterminetheelectroweakcouplingsofindividuallightflavoursatlep