Measurement of the weak dipole moments of the τ lepton

• Autores: Dova, María Teresa; L3 Collaboration
• Año de publicación: 1998
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Exactas; τ lepton; Z mass; anomalous magnetic dipole; Física; L3 experiment
• Institución: Universidad Nacional de La Plata

Using the data collected by the L3 experiment at LEP from 1991 to 1995 at energies around the Z mass, a measurement of the weak anomalous magnetic dipole moment, awτ, and of the weak electric dipole moment, dwτ, of the τ lepton is performed. These quantities are obtained from angular distributions in $\text{e}{}^{\mathrm{+}}\text{e}{}^{\mathrm{-}}\text{→τ}{}^{\mathrm{+}}\text{τ}{}^{\mathrm{-}}\text{→h}{}^{\mathrm{+}}\text{ν}\text{̄}{}_{\mathrm{\tau }}\text{h}{}^{\mathrm{-}}\text{ν}{}_{\mathrm{\tau }}$, where h is a π or a p. The results are: Re(awτ)=(0.0±1.6±2.3)×10−3, Im(awτ)=(−1.0±3.6±4.3)×10−3 and Re(dwτ)=(−0.44±0.88±1.33)×10−17e·cm. This is the first direct measurement of awτ.
Facultad de Ciencias Exactas