Search for CP violation in ZmF ττ

D Buskulic; D Decamp; C Goy; JP Lees; MN Minard; B Mours; R Alemany; F Ariztizabal; P Comas; JM Crespo; M Delfino; E Fernandez; V Gaitan; L Garrido; T Mattison; A Pacheco; A Pascual; D Creanza; M de Palma; A Farilla; G Iaselli; G Maggi; M Maggi; S Natali; S Nuzzo; M Quattromini; A Ranieri; G Raso; F Romano; F Ruggieri; G Selvaggi; L Silvestris; P Tempesta; G Zito; H Hu; D Huang; X Huang; J Lin; J Lou; C Qiao; T Wang; Y Xie; D Xu; R Xu; J Zhang; W Zhao; LAT Bauerdick; E Blucher; G Bonvicini; F Bossi; J Boudreau; D Casper; H Drevermann; RW Forty; G Ganis; C Gay; R Hagelberg; J Harvey; S Haywood; J Hilgart; R Jacobsen; B Jost; J Knobloch; E Lançon; I Lehraus; T Lohse; A Lusiani; M Martinez; P Mato; H Meinhard; A Minten; R Miquel; HG Moser; P Palazzi; JA Perlas; JF Pusztaszeri; F Ranjard; G Redlinger; L Rolandi; J Rothberg; T Ruan; M Saich; D Schlatter; M Schmelling; F Sefkow; W Tejessy; H Wachsmuth; W Wiedenmann; T Wildish; W Witzeling; J Wotschack; Z Ajaltouni; F Badaud; M Bardadin-Otwinowska; AM Bencheikh; R El Fellous; A Falvard; P Gay; C Guicheney; P Henrard

Journal article

Search for CP violation in ZmF ττ

D Buskulic, D Decamp, C Goy, JP Lees, MN Minard, B Mours, R Alemany, F Ariztizabal, P Comas, JM Crespo, M Delfino, E Fernandez, V Gaitan, L Garrido, T Mattison, A Pacheco, A Pascual, D Creanza, M de Palma, A Farilla Show all

Physics Letters B | ELSEVIER SCIENCE BV | Published : 1992

DOI: 10.1016/0370-2693(92)91285-H

Abstract

Using the 18.8 pb-1 of data accumulated at LEP in 1990 and 1991 with the ALEPH detector, a direct test of neutral current CP-invariance is performed by a search for CP-odd correlations in Z decays to τ pairs where both τ decay modes are identified. No evidence for CP-violation is observed. The weak dipole moment of the τ has been measured to be dτ(mZ) = (1.3 ± 1.4 ± 0.1) × 10-17 e·cm which results in an upper limit on the weak dipole moment of |dτ(mZ)| ≤ 3.7 × 10-17 e·cm with 95% confidence level. © 1992.