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Measurement of the strong coupling constant αs and the vector and axial-vector spectral functions in hadronic tau decays

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Measurement of the strong coupling constant αs and the vector and axial-vector spectral functions in hadronic tau decays. / OPAL Collaboration.
In: European Physical Journal C: Particles and Fields, Vol. 7, No. 4, 02.1999, p. 571-593.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

OPAL Collaboration 1999, 'Measurement of the strong coupling constant αs and the vector and axial-vector spectral functions in hadronic tau decays', European Physical Journal C: Particles and Fields, vol. 7, no. 4, pp. 571-593. https://doi.org/10.1007/s100529901061

APA

OPAL Collaboration (1999). Measurement of the strong coupling constant αs and the vector and axial-vector spectral functions in hadronic tau decays. European Physical Journal C: Particles and Fields, 7(4), 571-593. https://doi.org/10.1007/s100529901061

Vancouver

OPAL Collaboration. Measurement of the strong coupling constant αs and the vector and axial-vector spectral functions in hadronic tau decays. European Physical Journal C: Particles and Fields. 1999 Feb;7(4):571-593. doi: 10.1007/s100529901061

Author

OPAL Collaboration. / Measurement of the strong coupling constant αs and the vector and axial-vector spectral functions in hadronic tau decays. In: European Physical Journal C: Particles and Fields. 1999 ; Vol. 7, No. 4. pp. 571-593.

Bibtex

@article{8a542b7710074365ad799fb74d4ad2dc,
title = "Measurement of the strong coupling constant αs and the vector and axial-vector spectral functions in hadronic tau decays",
abstract = "The spectral functions of the vector current and the axial-vector current have been measured in hadronic ττ decays using the OPAL detector at LEP. Within the framework of the Operator Product Expansion a simultaneous determination of the strong coupling constant αsαs , 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 αs(m2τ)=0.348±0.009exp±0.019theoαs(mτ2)=0.348±0.009exp±0.019theo at the ττ -mass scale and αs(m2Z)=0.1219±0.0010exp±0.0017theoαs(mZ2)=0.1219±0.0010exp±0.0017theo at the Z0Z0 -mass scale. The values obtained for αs(m2Z)αs(mZ2) using Fixed Order Perturbation Theory or Renormalon Chain Resummation are 2.3% and 4.1% smaller, respectively. The {\textquoteleft}running{\textquoteright} of the strong coupling between s0≃1.3GeV2s0≃1.3GeV2 and s0=m2τs0=mτ2 has been tested from direct fits to the integrated differential hadronic decay rate Rτ(s0)Rτ(s0) . A test of the saturation of QCD sum rules at the ττ -mass scale has been performed.",
author = "Vakhtang Kartvelishvili and {OPAL Collaboration}",
year = "1999",
month = feb,
doi = "10.1007/s100529901061",
language = "English",
volume = "7",
pages = "571--593",
journal = "European Physical Journal C: Particles and Fields",
issn = "1434-6044",
publisher = "SPRINGER",
number = "4",

}

RIS

TY - JOUR

T1 - Measurement of the strong coupling constant αs and the vector and axial-vector spectral functions in hadronic tau decays

AU - Kartvelishvili, Vakhtang

AU - OPAL Collaboration

PY - 1999/2

Y1 - 1999/2

N2 - The spectral functions of the vector current and the axial-vector current have been measured in hadronic ττ decays using the OPAL detector at LEP. Within the framework of the Operator Product Expansion a simultaneous determination of the strong coupling constant αsαs , 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 αs(m2τ)=0.348±0.009exp±0.019theoαs(mτ2)=0.348±0.009exp±0.019theo at the ττ -mass scale and αs(m2Z)=0.1219±0.0010exp±0.0017theoαs(mZ2)=0.1219±0.0010exp±0.0017theo at the Z0Z0 -mass scale. The values obtained for αs(m2Z)αs(mZ2) using Fixed Order Perturbation Theory or Renormalon Chain Resummation are 2.3% and 4.1% smaller, respectively. The ‘running’ of the strong coupling between s0≃1.3GeV2s0≃1.3GeV2 and s0=m2τs0=mτ2 has been tested from direct fits to the integrated differential hadronic decay rate Rτ(s0)Rτ(s0) . A test of the saturation of QCD sum rules at the ττ -mass scale has been performed.

AB - The spectral functions of the vector current and the axial-vector current have been measured in hadronic ττ decays using the OPAL detector at LEP. Within the framework of the Operator Product Expansion a simultaneous determination of the strong coupling constant αsαs , 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 αs(m2τ)=0.348±0.009exp±0.019theoαs(mτ2)=0.348±0.009exp±0.019theo at the ττ -mass scale and αs(m2Z)=0.1219±0.0010exp±0.0017theoαs(mZ2)=0.1219±0.0010exp±0.0017theo at the Z0Z0 -mass scale. The values obtained for αs(m2Z)αs(mZ2) using Fixed Order Perturbation Theory or Renormalon Chain Resummation are 2.3% and 4.1% smaller, respectively. The ‘running’ of the strong coupling between s0≃1.3GeV2s0≃1.3GeV2 and s0=m2τs0=mτ2 has been tested from direct fits to the integrated differential hadronic decay rate Rτ(s0)Rτ(s0) . A test of the saturation of QCD sum rules at the ττ -mass scale has been performed.

U2 - 10.1007/s100529901061

DO - 10.1007/s100529901061

M3 - Journal article

VL - 7

SP - 571

EP - 593

JO - European Physical Journal C: Particles and Fields

JF - European Physical Journal C: Particles and Fields

SN - 1434-6044

IS - 4

ER -