A precise measurement of the τ lepton lifetime

D. Buskulic, D. Decamp, C. Goy, J. P. Lees, M. N. Minard, B. Mours, R. Alemany, F. Ariztizabal, P. Comas, J. M. Crespo, M. Delfino, E. Fernandez, V. Gaitan, Ll Garrido, T. Mattison, A. Pacheco, C. Padilla, A. Pascual, D. Creanza, M. de PalmaA. Farilla, G. Iaselli, G. Maggi, M. Maggi, S. Natali, S. Nuzzo, M. Quattromini, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, H. Hu, D. Huang, X. Huang, J. Lin, J. Lou, C. Qiao, T. Wang, Y. Xie, D. Xu, R. Xu, J. Zhang, W. Zhao, L. A.T. Bauerdick, E. Blucher, G. Bonvicini, F. Bossi, J. Boudreau, D. Casper, H. Drevermann, R. W. Forty, G. Ganis, C. Gay, R. Hagelberg, J. Harvey, S. Haywood, J. Hilgart, R. Jacobsen, B. Jost, J. Knobloch, E. Lançon, I. Lehraus, T. Lohse, A. Lusiani, M. Martinez, P. Mato, H. Meinhard, A. Minten, R. Miquel, H. G. Moser, P. Palazzi, J. A. Perlas, J. F. Pusztaszeri, F. Ranjard, G. Redlinger, L. Rolandi, J. Rothberg, T. Ruan, M. Saich, D. Schlatter, M. Schmelling, F. Sefkow, W. Tejessy, H. Wachsmuth, W. Wiedenmann, T. Wildish, W. Witzeling, J. Wotschack, Z. Ajaltouni, F. Badaud, M. Bardadin-Otwinowska, A. M. Bencheikh, R. El Fellous, A. Falvard, P. Gay, C. Guicheney

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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. © 1992.
Original languageEnglish
Pages (from-to)432-448
JournalPhysics Letters B
Volume297
Issue number3-4
DOIs
Publication statusPublished - 31 Dec 1992

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    Buskulic, D., Decamp, D., Goy, C., Lees, J. P., Minard, M. N., Mours, B., Alemany, R., Ariztizabal, F., Comas, P., Crespo, J. M., Delfino, M., Fernandez, E., Gaitan, V., Garrido, L., Mattison, T., Pacheco, A., Padilla, C., Pascual, A., Creanza, D., ... Guicheney, C. (1992). A precise measurement of the τ lepton lifetime. Physics Letters B, 297(3-4), 432-448. https://doi.org/10.1016/0370-2693(92)91283-F