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Search for anomalous weak dipole moments of the tau lepton

ALEPH Collaboration, The and Heister, A. and Bouhova-Thacker, Evelina and Bowdery, Christopher and Finch, Alexander and Foster, Frank and Hughes, Gareth and Jones, Roger (2003) Search for anomalous weak dipole moments of the tau lepton. European Physical Journal C: Particles and Fields, 30 (3). pp. 291-304. ISSN 1434-6044

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Abstract

The anomalous weak dipole moments of the τ 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−→τ+τ− at energies close to the Z mass are studied using their semileptonic decays to π , ρ , a1→π2π0 or a1→3π . The real and imaginary components of both the anomalous weak magnetic dipole moment and the CP-violating anomalous weak electric dipole moment, Reμτ , Imμτ , Redτ and Imdτ , 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): |Reμτ|<1.14×10−3 , |Imμτ|<2.65×10−3 , |Redτ|<0.91×10−3 , and |Imdτ|<2.01×10−3 .

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63903
Deposited By: ep_importer_pure
Deposited On: 02 May 2013 11:11
Refereed?: Yes
Published?: Published
Last Modified: 18 Nov 2017 12:16
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/63903

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