The τ lifetime has been measured with the OPAL detector at LEP, from analyses using the impact parameters in decays to single charged tracks, and the decay lengths from τ decays to three charged tracks. The 1991 sample of approximately 12300 τ-pair events, of which 70% contain silicon microvertex detector information, has been combined with a re-analysis of the 5100 events recorded during 1990. The two statistically-independent determinations give:

$$\begin{gathered} \tau (one - prong) = 296.4 \pm 7.1 (stat) \pm 3.8 (sys) fs, \hfill \\ \tau (three - prong) = 286.3 \pm 7.4 (stat) \pm 5.2 (sys) fs. \hfill \\ \end{gathered} $$

The weighted average of these results after combination of the uncorrelated systematic errors is:

$$\tau _\tau = 291.9 \pm 5.1 (stat) \pm 3.1 (sys) fs.$$

.

/pdf/measurement-of-the-t-lifetime-2i5nknr54g.pdf

Measurement of the τ lifetime

A precise measurement of the τ lepton lifetime

Updated measurement of the τ lifetime

In this paper it is shown that particle lifetime measurements based on reconstruction of charged decay products are subject to a bias arising from correlations of the tracking errors. The effects of correlated tracking errors on existing lifetime measurements of charm and bottom hadrons and the [tau] lepton are examined. The bias can be significant in the case of the [tau].

/pdf/systematic-biases-in-particle-lifetime-measurements-4ps5nq1l8j.pdf

Systematic biases in particle lifetime measurements

The precisions of τ lifetime measurements have increased remarkably in the last several years. The techniques which lead to these results are summarized and compared, together with results obtained by different experiments from use of these methods. By combining the recent, and previous lifetime values an updated world average lifetime of ττ=(927.7±1.6) fs is obtained, which is in good agreement with the prediction derived from the τ electronic branching ratio through the assumption of τ-μ lepton universality.

Measurements of the τ lepton lifetime

A Measurement of the tau lepton lifetime

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A Measurement of the tau lepton lifetime