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DELPHI Collaboration; Castillo Giménez, María Victoria; Ferrer Soria, Antonio; Higón Rodríguez, Emilio; Alemany Fernández, Reyes; Cabrera Urbán, Susana; Cortina Gil, Eduardo; Fuster Verdú, Juan A.; García García, Carmen; Hernández Rey, Juan José; Lacasta Llácer, Carlos; Martínez Vidal, Fernando; Martí García, Salvador; Navas Concha, Sergio; Salt Cairols, José | |||
Aquest document és un/a article, creat/da en: 1996 | |||
Este documento está disponible también en : 10.1016/0370-2693(95)01434-9 |
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The tau lepton lifetime has been measured using three different methods with the DELPHI detector. Two measurements of one-prong decays are combined, accounting for correlations, giving a result of ττ = 291.8 ± 3.3 (stat.) ± 2.0(sys.) fs while the decay length distribution of three-prong decays gives the result ττ = 286.7 ± 4.9 (stat.) ±3.3 (sys.) fs. Combining the results presented here with previous DELPHI measurements, we get ττ = 291.4 ± 3.0 fs and find that the ratio of the coupling constant for tau decay relative to that for muon decay is 0.990 ± 0.009, compatible with lepton universality. | |||
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