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Measurement of the Michel parameters in leptonic tau decays

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Measurement of the Michel parameters in leptonic tau decays. / OPAL Collaboration.
In: European Physical Journal C: Particles and Fields, Vol. 8, No. 1, 03.1999, p. 3-21.

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

Harvard

OPAL Collaboration 1999, 'Measurement of the Michel parameters in leptonic tau decays', European Physical Journal C: Particles and Fields, vol. 8, no. 1, pp. 3-21. https://doi.org/10.1007/s100529901080

APA

OPAL Collaboration (1999). Measurement of the Michel parameters in leptonic tau decays. European Physical Journal C: Particles and Fields, 8(1), 3-21. https://doi.org/10.1007/s100529901080

Vancouver

OPAL Collaboration. Measurement of the Michel parameters in leptonic tau decays. European Physical Journal C: Particles and Fields. 1999 Mar;8(1):3-21. doi: 10.1007/s100529901080

Author

OPAL Collaboration. / Measurement of the Michel parameters in leptonic tau decays. In: European Physical Journal C: Particles and Fields. 1999 ; Vol. 8, No. 1. pp. 3-21.

Bibtex

@article{651db64e65264e8bbf2e06d3dcbc399f,
title = "Measurement of the Michel parameters in leptonic tau decays",
abstract = "The Michel parameters of the leptonic ττ decays are measured using the OPAL detector at LEP. The parameters ρℓρℓ , ξℓξℓ , (ξδ)ℓ(ξδ)ℓ (with ℓ=e,μℓ=e,μ ) and ημημ are extracted from the energy spectra of the charged decay leptons and from their energy–energy correlations. A new method involving a global likelihood fit of Monte Carlo generated events with complete detector simulation and background treatment has been applied to the data recorded at center-of-mass energies close to s√=mZ0s=mZ0 corresponding to an integrated luminosity of 155 pb −1−1 . If e- μμ universality is assumed and inferring the ττ polarization from neutral current data, the measured Michel parameters are: where the value of ηη has been constrained using the published OPAL measurements of the leptonic branching ratios and the ττ lifetime. Limits on non-standard coupling constants and on the masses of new gauge bosons are obtained. The results are in agreement with the V–A prediction of the Standard Model.",
author = "Vakhtang Kartvelishvili and {OPAL Collaboration}",
year = "1999",
month = mar,
doi = "10.1007/s100529901080",
language = "English",
volume = "8",
pages = "3--21",
journal = "European Physical Journal C: Particles and Fields",
issn = "1434-6044",
publisher = "SPRINGER",
number = "1",

}

RIS

TY - JOUR

T1 - Measurement of the Michel parameters in leptonic tau decays

AU - Kartvelishvili, Vakhtang

AU - OPAL Collaboration

PY - 1999/3

Y1 - 1999/3

N2 - The Michel parameters of the leptonic ττ decays are measured using the OPAL detector at LEP. The parameters ρℓρℓ , ξℓξℓ , (ξδ)ℓ(ξδ)ℓ (with ℓ=e,μℓ=e,μ ) and ημημ are extracted from the energy spectra of the charged decay leptons and from their energy–energy correlations. A new method involving a global likelihood fit of Monte Carlo generated events with complete detector simulation and background treatment has been applied to the data recorded at center-of-mass energies close to s√=mZ0s=mZ0 corresponding to an integrated luminosity of 155 pb −1−1 . If e- μμ universality is assumed and inferring the ττ polarization from neutral current data, the measured Michel parameters are: where the value of ηη has been constrained using the published OPAL measurements of the leptonic branching ratios and the ττ lifetime. Limits on non-standard coupling constants and on the masses of new gauge bosons are obtained. The results are in agreement with the V–A prediction of the Standard Model.

AB - The Michel parameters of the leptonic ττ decays are measured using the OPAL detector at LEP. The parameters ρℓρℓ , ξℓξℓ , (ξδ)ℓ(ξδ)ℓ (with ℓ=e,μℓ=e,μ ) and ημημ are extracted from the energy spectra of the charged decay leptons and from their energy–energy correlations. A new method involving a global likelihood fit of Monte Carlo generated events with complete detector simulation and background treatment has been applied to the data recorded at center-of-mass energies close to s√=mZ0s=mZ0 corresponding to an integrated luminosity of 155 pb −1−1 . If e- μμ universality is assumed and inferring the ττ polarization from neutral current data, the measured Michel parameters are: where the value of ηη has been constrained using the published OPAL measurements of the leptonic branching ratios and the ττ lifetime. Limits on non-standard coupling constants and on the masses of new gauge bosons are obtained. The results are in agreement with the V–A prediction of the Standard Model.

U2 - 10.1007/s100529901080

DO - 10.1007/s100529901080

M3 - Journal article

VL - 8

SP - 3

EP - 21

JO - European Physical Journal C: Particles and Fields

JF - European Physical Journal C: Particles and Fields

SN - 1434-6044

IS - 1

ER -