Improved measurement of the lifetime of the τ lepton

The OPAL Collaboration

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


A new measurement of the τ lifetime is presented. It uses data collected with the OPAL detector during 1994, which almost doubles the size of the OPAL τ sample. Two statistically independent techniques are used: an impact parameter analysis of one-prong decay tracks and a fit to the decay length distribution of three-prong decays. The lifetime obtained from the 1994 data by combining the results of these methods is ττ = 289.7 ± 2.5(stat) ± 1.5(sys) fs. When combined with the previous OPAL τ lifetime measurement the improved τ lifetime is ττ = 289.2 ± 1.7(stat.) ± 1.2(sys.) fs.

Original languageEnglish
Pages (from-to)341-350
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number4
StatePublished - 9 May 1996
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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