Properties of the proposed τ charged lepton

M. L. Perl, G. L. Feldman, G. S. Abrams, M. S. Alam, A. M. Boyarski, M. Breidenbach, J. Dorfan, W. Chinowsky, G. Goldhaber, G. Hanson, J. A. Jaros, J. A. Kadyk, D. Lüke, V. Lüth, R. J. Madaras, H. K. Nguyen, J. M. Paterson, I. Peruzzi, M. Piccolo, T. P. PunP. A. Rapidis, B. Richter, W. Tanenbaum, J. E. Wiss

Research output: Contribution to journalArticlepeer-review


The anomalous eμ and 2-prong μx events produced in e+e- annihilation are used to determine the properties of the proposed τ charged lepton. We find the τ mass is 1.90 ± 0.10 GeV/c2; the mass of the associated neutrino, ντ, is less than 0.6 GeV/c2 with 95% confidence; V - A coupling is favored over V + A coupling for the τ - ντ current; and the leptonic branching ratios are 0.186 ± 0.010 ± 0.028 from the eμ events and 0.175 ± 0.027 ± 0.030 from the μx events where the first error is statistical and the second is systematic.

Original languageEnglish (US)
Pages (from-to)487-490
Number of pages4
JournalPhysics Letters B
Issue number4
StatePublished - Oct 24 1977

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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