The anomalous weak dipole moments of the lepton are measured in a data sample collected by ALEPH from 1990 to 1995 corresponding to an integrated luminosity of 155 pb-1. Tau leptons produced in the reaction e+e−+− at energies close to the Z mass are studied using their semileptonic decays to , , a120 or a13 . The real and imaginary components of both the anomalous weak magnetic dipole moment and the CP-violating anomalous weak electric dipole moment, Re , Im , Red and Imd , are measured simultaneously by means of a likelihood fit built from the full differential cross section. No evidence of new physics is found. The following bounds are obtained (95% CL): Re11410−3 , Im26510−3 , Red09110−3 , and Imd20110−3 .
Search for anomalous weak dipole moments of the tau lepton / A. Heister et al.;V.Ciulli;E.Focardi. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - ELETTRONICO. - 30:(2003), pp. 291-304. [10.1140/epjc/s2003-01286-1]
Search for anomalous weak dipole moments of the tau lepton
CIULLI, VITALIANO;FOCARDI, ETTORE
2003
Abstract
The anomalous weak dipole moments of the lepton are measured in a data sample collected by ALEPH from 1990 to 1995 corresponding to an integrated luminosity of 155 pb-1. Tau leptons produced in the reaction e+e−+− at energies close to the Z mass are studied using their semileptonic decays to , , a120 or a13 . The real and imaginary components of both the anomalous weak magnetic dipole moment and the CP-violating anomalous weak electric dipole moment, Re , Im , Red and Imd , are measured simultaneously by means of a likelihood fit built from the full differential cross section. No evidence of new physics is found. The following bounds are obtained (95% CL): Re11410−3 , Im26510−3 , Red09110−3 , and Imd20110−3 .
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