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Publication
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Physics Letters B | 1992
D. Buskulic; D. Decamp; C. Goy; J. P. Lees; M.-N. Minard; B. Mours; Z. Ajaltouni; F. Badaud; M. Bardadin-Otwinowska; A.M. Bencheikh; R. El Fellous; A. Falvard; C. Guicheney; Pierre Henrard; J. Jousset; B. Michel; Jean-Claude Montret; D. Pallin; Pascal Perret; B. Pietrzyk; J. Proriol; F. Prulhiere; G. Stimpfl; J. Badier; A. Blondel; G. R. Bonneaud; J.C. Brient; G. Fouque; S. Orteu; A. Rosowsky
Abstract Three different techniques are used to measure the mean decay length of the τ lepton with a high precision vertex detector in a sample of 11 800 τ pairs coming from Z decays, collected in1991 by ALEPH at LEP. Events in which both τs decay into one charged track are analyzed using two largely independent methods. Displaced vertices in three-prong decays yield another independent measurement. The derived lifetime is 295.5 ± 5.9 ± 3.1 fs, using m τ = 1777.1 ± 0.5 MeV/ c 2 . Including previous (1989–1990) ALEPH measurements, the combined τ lifetime is 294.7 ± 5.4 ± 3.0 fs.
Physics Letters B | 1992
D. Buskulic; D. Decamp; C. Goy; J. P. Lees; M.-N. Minard; B. Mours; Z. Ajaltouni; F. Badaud; M. Bardadin-Otwinowska; A.M. Bencheikh; R. El Fellous; A. Falvard; C. Guicheney; Pierre Henrard; J. Jousset; B. Michel; Jean-Claude Montret; D. Pallin; Pascal Perret; B. Pietrzyk; J. Proriol; F. Prulhiere; G. Stimpfl; J. Badier; A. Blondel; G. R. Bonneaud; J.C. Brient; G. Fouque; S. Orteu; A. Rosowsky
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