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 τ's 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 mτ = 1777.1 ± 0.5 MeV/c2. Including previous (1989-1990) ALEPH measurements, the combined τ lifetime is 294.7 ± 5.4 ± 3.0 fs.

Buskulic, D., Decamp, D., Goy, C., Lees, J., Minard, M., Mours, B., et al. (1992). A precise measurement of the τ lepton lifetime. PHYSICS LETTERS. SECTION B, 297(3-4), 432-448 [10.1016/0370-2693(92)91283-F].

A precise measurement of the τ lepton lifetime

CARPINELLI, Massimo;
1992

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 τ's 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 mτ = 1777.1 ± 0.5 MeV/c2. Including previous (1989-1990) ALEPH measurements, the combined τ lifetime is 294.7 ± 5.4 ± 3.0 fs.
Articolo in rivista - Articolo scientifico
Z-DECAYS
English
432
448
17
Buskulic, D., Decamp, D., Goy, C., Lees, J., Minard, M., Mours, B., et al. (1992). A precise measurement of the τ lepton lifetime. PHYSICS LETTERS. SECTION B, 297(3-4), 432-448 [10.1016/0370-2693(92)91283-F].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390434
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