L3 measurement of the tau lepton lifetime

Authors
Citation
Ap. Colijn, L3 measurement of the tau lepton lifetime, NUCL PH B-P, 76, 1999, pp. 101-106
Citations number
5
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS
ISSN journal
0920-5632 → ACNP
Volume
76
Year of publication
1999
Pages
101 - 106
Database
ISI
SICI code
0920-5632(199904)76:<101:LMOTTL>2.0.ZU;2-J
Abstract
The tau lepton lifetime is measured with the L3 detector at LEP. For the an alysis presented here tau pairs produced during 1994 and 1995 around the Z pole are used. The measurement is done by a decay length method for the 3-p rong tau decays and by an impact parameter analysis for the 1-prong decays. From the data 6 620 3-prong decays are selected, from which a lifetime of tau(tau) = 291.4 +/- 3.9 (stat) +/- 2.0 (syst) fs is determined. The impact parameter analysis on 58 656 1-prong decays results in a lifetime of tau(t au) = 290.5 +/- 2.7 (stat) +/- 2.9 (syst) fs. Combination with our previous results gives tau(tau) = 291.7 +/- 2.0 (stat) +/- 1.8 (syst) fs. These num bers are preliminary.