A measurement of the lifetime of the tau lepton

A measurement of the lifetime of the tau lepton

The lifetime of the tau lepton has been measured by two independent methods using a silicon microvertex detector installed in the DELPHI detector. The signed impact parameter distribution of the one prong decays yielded a lifetime of τ τ = 321 ± 36 (stat.) ± 16 (syst.) fs, while the decay length dis...

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Veröffentlicht in:Physics letters. B 1991-09, Vol.267 (3), p.422-430
Hauptverfasser: Almehed, S., Alvsvaag, S.J., Antilogus, P., Astier, P., Baroncelli, A., Baubillier, M., Belokopytov, Yu, Beltran, P., Bertrand, D., Bianchi, F., Bilenky, M.S., Billoir, P., Bogolubov, P.N., Booth, P.S.L., Bostjancic, B., Brunet, J.-M., Burmeister, H., Caccia, M., Carena, F., Castillo Gimenez, M.V., Chevalier, L., Crennell, D., Crozon, M., Czellar, S., Darbo, G., Davenport, M., Delikaris, D., Demaria, N., Doroba, K., Dufour, Y., Dulinski, W., Eek, L.-O., Engel, J.-P., Forsbach, H., Frodesen, A.G., Fuster, J., Gavillet, P., Golovatyuk, V.M., Gorski, M., Grard, F., Graziani, E., Gross, E., Grossetete, B., Hahn, M., Herquet, P., Higon, E., Hofmokl, T., Holmes, R., Houlden, M., Iversen, P.-S., Jackson, J.N., Jarlskog, G., Jean-Marie, B., Johansson, E.K., Jonker, M., Kalkanis, G., Kantardjian, G., Kluit, P., Korcyl, K., Laugier, J.-P., Lindgren, J., Loerstad, B., Lyons, L., Mandl, F., Marin, J.-C., Michelotto, M., Muller, H., Pape, L., Passeri, A., Perevozchikov, V., Pierre, F., Pinsent, A., Pol, M.E., Polok, G., Pullia, A., Redaelli, N.G., Regler, M., Resvanis, L.K., Richardson, M., Roncagliolo, I., Roudeau, P., Sannino, M., Seufert, R., Smadja, G., Stanescu, C., Tkatchev, L.G., Tsirou, A., Turluer, M.-L., Tyndel, M., Ueberschaer, S., Vander Velde, C., Ventura, L., Verbeure, F., Wetherell, A.M., Wickens, J.H., Wikne, J., Wilkinson, G.R., Yepes, P., Zalewski, P., Zumerle, G.
Format: Artikel
Sprache:eng
Schlagworte:
Exact sciences and technology
High Energy Physics - Experiment
Physics
Statistical physics, thermodynamics, and nonlinear dynamical systems
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Zusammenfassung:The lifetime of the tau lepton has been measured by two independent methods using a silicon microvertex detector installed in the DELPHI detector. The signed impact parameter distribution of the one prong decays yielded a lifetime of τ τ = 321 ± 36 (stat.) ± 16 (syst.) fs, while the decay length distribution of three prong decays gave the result τ τ = 310 ± 31 (stat.) ± 9 (syst.) fs. The final value of the combined result was τ τ = 314 ± 25 fs. The ratio of the Fermi coupling constant from tau decay relative to that from muon decay was found to be 0.95 ± 0.04, compatible with the hypothesis of lepton universality.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(91)90957-R