Anomalous e+e- and μ+μ- events produced in e+e- annihilation

F. B. Heile, M. L. Perl, G. S. Abrams, M. S. Alam, A. M. Boyarski, M. Breidenbach, J. Dorfan, G. J. Feldman, G. Goldhaber, G. Hanson, J. A. Jaros, J. A. Kadyk, D. Lüke, R. J. Madaras, A. E. Nelson, J. M. Paterson, I. Peruzzi, M. Piccolo, T. Pun, P. RapidisJ. E. Wiss, G. Grammer

Research output: Contribution to journalArticlepeer-review


We have observed events of the form e++e- → e++e- and e++e- → μ+- in which there are no other detected particles and there is substantial missing energy; and which cannot be explained by conventional electromagnetic interactions. We show that these events can be explained as the decay products from the pair production, e++e- → τ+-, of a new charged lepton, τ±, of mass ≈1800 MeV/c2. Some properties of these events are presented. In particular, this production cross section is inconsistent with the τ being an electron-related paralepton.

Original languageEnglish (US)
Pages (from-to)189-217
Number of pages29
JournalNuclear Physics, Section B
Issue number2
StatePublished - Jun 12 1978
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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