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Measurement of the tau lepton lifetime with the three-dimensional impact parameter method

Barate, R. and Finch, Alexander (1997) Measurement of the tau lepton lifetime with the three-dimensional impact parameter method. Zeitschrift für Physik C Particles and Fields, 74 (3). pp. 387-398. ISSN 0170-9739

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Abstract

A new method is presented for the measurement of the mean tau lepton lifetime using events in which tau's are pair-produced and both tau's decay to hadrons and nu(tau). Based on the correlation between the two tau's produced at a symmetric e(+)e(-) collider, the 3DIP method relies on the three-dimensional information from a double-sided vertex detector and on kinematic constraints for the precise measurement of the tau decay angles. Using the data collected from 1992 to 1994 with the ALEPH detector at LEP, a tau lifetime of 288.0 +/- 3.1 +/- 1.3 fs is obtained from the sample in which both tau's decay to one charged track, and 292.8 +/- 5.6 +/- 3.0 fs from the sample in which one tau decays to one prong and the other to three prongs. The results show small statistical correlations with those derived from other methods. When combined with the previously published ALEPH measurements, the resulting tau lifetime is 291.2 +/- 2.0 +/- 1.2 fs.

Item Type: Article
Journal or Publication Title: Zeitschrift für Physik C Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 64022
Deposited By: ep_importer_pure
Deposited On: 14 May 2013 15:46
Refereed?: Yes
Published?: Published
Last Modified: 17 Nov 2017 11:25
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/64022

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