A measurement of the tau lifetime

The tau lepton lifetime is measured using four different methods with the DELPHI detector. Three measurements using one prong decays are combined, accounting for correlations, resulting in τ τ =298 ±7 (stat.)±4 (syst.) fs while the decay length distribution of three prong decays gives π π =298±13 (s...

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Veröffentlicht in:	Physics letters. B 1993-03, Vol.302 (2), p.356-368
Hauptverfasser:	Alvsvaag, S.J., Amaldi, U., Barate, R., Baroncelli, A., Barrio, J.A., Bloch, D., Booth, P.S.L., Bostjancic, B., Bowcock, T.J.V., Bugge, L., Buran, T., Camacho Rozas, A.J., Campion, R., Cao, F., Carroll, L., Chan, A., Chauveau, J., Chelkov, G.A., Contri, R., Crawley, H.B., Dalmagne, B., Daubie, E., Daum, A., Delpierre, P., De Clercq, C., Donszelmann, M., Ekelof, T., Engel, J.-P., Fenyuk, A., Fontanelli, F., Forbes, K.A.J., Fousset, J.-L., Gamba, D., Gaspar, C., Gavillet, Ph, Golob, B., Grosdidier, G., Hamacher, K., Herr, H., Hietanen, I., Higon, E., Hilke, H.J., Holmes, R., Ioannou, P., Iversen, P.-S., Jarry, P., Karvelas, E., Kesteman, J., Khovanski, N.N., Kluit, P., Kurvinen, K., Lanceri, L., Lauhakangas, R., Leitner, R., Lemoigne, Y., Lemonne, J., Loerstad, B., Maltezos, A., Marco, J., Matorras, F., Mc Nay, R., Meyer, W.T., Monge, M.R., Mueller, H., Nikolaenko, V., Olshevski, A.G., Ostankov, A., Pingot, O., Pol, M.E., Polok, G., Privitera, P., Richardson, M., Rosenberg, E.I., Rossi, U., Rosso, E., Roudeau, P., Sannino, M., Sette, G., Stichelbaut, F., Stocchi, A., Tchikilev, O., Timofeev, V.G., Toet, D.Z., Trischuk, W., Turluer, M.-L., Ueberschaer, S., Valls Ferrer, J.A., Ventura, L., Verbeure, F., Vilanova, D., Vodopyanov, A.S., Voutilainen, M., Wahlen, H., Weilhammer, P., Wetherell, A.M., Williams, W.S.C., Yepes, P., Zito, M., Zukanovich Funchal, R., Zumerle, G.
Format:	Artikel
Sprache:	eng
Schlagworte:	Exact sciences and technology High Energy Physics - Experiment Leptons Physics Properties of specific particles The physics of elementary particles and fields
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Beschreibung
Zusammenfassung:	The tau lepton lifetime is measured using four different methods with the DELPHI detector. Three measurements using one prong decays are combined, accounting for correlations, resulting in τ τ =298 ±7 (stat.)±4 (syst.) fs while the decay length distribution of three prong decays gives π π =298±13 (stat)±(syst.) fs. The combined result is τ τ =298±7 fs. The ratio of the Fermi coupling constant from tau decay relative to that from muon decay is found to be 0.985±0.013, compatible with lepton universality.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/0370-2693(93)90409-B