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Messung der starken Kopplungskonstanten $\alpha_{s}$ und der hadronischen Spektralfunktionen in $\tau$-Zerfällen
The spectral functions of the vector current and the axial-vector current have been measured in hadronic tau decays using the OPAL detector at LEP. Within the framework of the operator product expansion a simultaneous determination of the strong coupling constant alpha /sub s/, the non-perturbative...
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Lenguaje: | ger |
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Bonn Univ.
1998
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Acceso en línea: | http://cds.cern.ch/record/409207 |
_version_ | 1780894499001597952 |
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author | Menke, Sven |
author_facet | Menke, Sven |
author_sort | Menke, Sven |
collection | CERN |
description | The spectral functions of the vector current and the axial-vector current have been measured in hadronic tau decays using the OPAL detector at LEP. Within the framework of the operator product expansion a simultaneous determination of the strong coupling constant alpha /sub s/, the non-perturbative operators of dimension 6 and 8 and of the gluon condensate has been performed. Different perturbative descriptions have been compared to the data. The contour improved fixed order perturbation theory gives alpha /sub s/(m/sub tau //sup 2/)=0.348+or-0.009/sub exp/+or-0.019/sub theo/ at the tau - mass scale and alpha /sub s/(m/sub Z//sup 2/)=0.1219+or-0.0010/sub exp/+or-0.0017/sub theo/ at the Z/sup 0/-mass scale. The values obtained for alpha /sub s/(m/sub Z//sup 2/) using fixed order perturbation theory or renormalon chain resummation are 2.3and 4.1 smaller, respectively. The `running' of the strong coupling between s /sub 0/ equivalent to 1.3 GeV/sup 2/ and s/sub 0/=m/sub tau //sup 2/ has been tested from direct fits to the integrated differential hadronic decay rate R/sub tau /(s/sub 0/). A test of the saturation of QCD sum rules at the tau -mass scale has been performed. (86 refs) . |
id | cern-409207 |
institution | Organización Europea para la Investigación Nuclear |
language | ger |
publishDate | 1998 |
publisher | Bonn Univ. |
record_format | invenio |
spelling | cern-4092072019-09-30T06:29:59Zhttp://cds.cern.ch/record/409207gerMenke, SvenMessung der starken Kopplungskonstanten $\alpha_{s}$ und der hadronischen Spektralfunktionen in $\tau$-ZerfällenParticle Physics - ExperimentThe spectral functions of the vector current and the axial-vector current have been measured in hadronic tau decays using the OPAL detector at LEP. Within the framework of the operator product expansion a simultaneous determination of the strong coupling constant alpha /sub s/, the non-perturbative operators of dimension 6 and 8 and of the gluon condensate has been performed. Different perturbative descriptions have been compared to the data. The contour improved fixed order perturbation theory gives alpha /sub s/(m/sub tau //sup 2/)=0.348+or-0.009/sub exp/+or-0.019/sub theo/ at the tau - mass scale and alpha /sub s/(m/sub Z//sup 2/)=0.1219+or-0.0010/sub exp/+or-0.0017/sub theo/ at the Z/sup 0/-mass scale. The values obtained for alpha /sub s/(m/sub Z//sup 2/) using fixed order perturbation theory or renormalon chain resummation are 2.3and 4.1 smaller, respectively. The `running' of the strong coupling between s /sub 0/ equivalent to 1.3 GeV/sup 2/ and s/sub 0/=m/sub tau //sup 2/ has been tested from direct fits to the integrated differential hadronic decay rate R/sub tau /(s/sub 0/). A test of the saturation of QCD sum rules at the tau -mass scale has been performed. (86 refs) .Bonn Univ.BONN-IR-98-13oai:cds.cern.ch:4092071998 |
spellingShingle | Particle Physics - Experiment Menke, Sven Messung der starken Kopplungskonstanten $\alpha_{s}$ und der hadronischen Spektralfunktionen in $\tau$-Zerfällen |
title | Messung der starken Kopplungskonstanten $\alpha_{s}$ und der hadronischen Spektralfunktionen in $\tau$-Zerfällen |
title_full | Messung der starken Kopplungskonstanten $\alpha_{s}$ und der hadronischen Spektralfunktionen in $\tau$-Zerfällen |
title_fullStr | Messung der starken Kopplungskonstanten $\alpha_{s}$ und der hadronischen Spektralfunktionen in $\tau$-Zerfällen |
title_full_unstemmed | Messung der starken Kopplungskonstanten $\alpha_{s}$ und der hadronischen Spektralfunktionen in $\tau$-Zerfällen |
title_short | Messung der starken Kopplungskonstanten $\alpha_{s}$ und der hadronischen Spektralfunktionen in $\tau$-Zerfällen |
title_sort | messung der starken kopplungskonstanten $\alpha_{s}$ und der hadronischen spektralfunktionen in $\tau$-zerfällen |
topic | Particle Physics - Experiment |
url | http://cds.cern.ch/record/409207 |
work_keys_str_mv | AT menkesven messungderstarkenkopplungskonstantenalphasundderhadronischenspektralfunktionenintauzerfallen |