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Article
Report number hep-ex/9808016 ; CERN-EP-98-104 ; CERN-EP-98-104
Title Measurement of the Michel Parameters in Leptonic Tau Decays
Author(s) OPAL Collaboration  Zeige alle 321 Autoren
Affiliation (CERN)
Publication 1999
Imprint 29 Jun 1998
Number of pages 32
In: Eur. Phys. J. C 8, 1 (1999) pp.3-21
DOI 10.1007/s100529901080
10.1007/s100520050441
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; OPAL
Abstract The Michel parameters of the leptonic tau decays are measured using the OPAL detector at LEP. The Michel parameters 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 sqrt(s) = M(Z) corresponding to an integrated luminosity of 155 pb-1 during the years 1990 to 1995. If e-mu universality is assumed and inferring the tau polarization from neutral current data, the measured Michel parameters are extracted. 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.

Corresponding record in: Inspire
Email contact: richard.hemingway@cern.ch


 Datensatz erzeugt am 1998-08-20, letzte Änderung am 2021-10-29


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