A measurement of the Michel parameters and the average helicity in lepton decays is described. The data was collected with the ALEPH detector at LEP during the years 1991 to 1995. A total integrated luminosity of 155 is analysed. The Michel parameters , and are determined for the leptonic decays, and the chirality parameters , and for the hadronic final states. Under the assumptions of e- universality and , the values , and are obtained. No significant deviation is observed from the Standard Model assumption of the V-A structure of the charged weak interaction.
Measurement of the Michel parameters and the nu/tau helicity in tau lepton decays / A. Heister et al.;V.Ciulli; E. Focardi. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - ELETTRONICO. - 22:(2001), pp. 217-230. [10.1007/s100520100813]
Measurement of the Michel parameters and the nu/tau helicity in tau lepton decays
CIULLI, VITALIANO;FOCARDI, ETTORE
2001
Abstract
A measurement of the Michel parameters and the average helicity in lepton decays is described. The data was collected with the ALEPH detector at LEP during the years 1991 to 1995. A total integrated luminosity of 155 is analysed. The Michel parameters , and are determined for the leptonic decays, and the chirality parameters , and for the hadronic final states. Under the assumptions of e- universality and , the values , and are obtained. No significant deviation is observed from the Standard Model assumption of the V-A structure of the charged weak interaction.
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