Precise measurements of the leptonic branching ratios of the tau lepton

W. W. Ash, H. R. Band, H. T. Blume, T. Camporesi, G. B. Chadwick, R. W. Coombes, M. C. Delfino, E. Fernandez, W. T. Ford, M. W. Gettner, G. P. Goderre, D. E. Groom, B. K. Heltsley, R. B. Hurst, J. R. Johnson, K. H. Lau, T. L. Lavine, R. E. Leedy, I. Lippi, T. MaruyamaR. L. Messner, J. H. Moromisato, L. J. Moss, F. Muller, H. N. Nelson, I. Peruzzi, M. Piccolo, R. Prepost, N. Qi, A. L. Read, D. M. Ritson, L. J. Rosenberg, W. D. Shambroom, J. C. Sleeman, J. G. Smith, J. P. Venuti, E. Von Goeler, P. Verdini, H. B. Wald, Roy Weinstein, D. E. Wiser, R. W. Zdarko

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20 Citations (Scopus)

Abstract

Precise measurements are reported for the leptonic branching ratios of the lepton from the reaction e+e-+- observed with the MAC detector operating at the SLAC storage ring PEP. Results from samples in which one decays into three charged particles and the other to e or are Be=0.180 0.009 0.006 and B=0.183 0.009 0.005. A sample of e events gives BeB=0.0288 0.0017 0.0019. With the assumption of e- universality, these results are combined to give Be=0.178 0.005, which implies a lifetime of (2.85 0.09)×10-13 sec. © 1985 The American Physical Society.
Original languageEnglish
Pages (from-to)2118-2121
JournalPhysical Review Letters
Volume55
Issue number20
DOIs
Publication statusPublished - 1 Jan 1985

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