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Evidence for Anomalous Lepton Production in e+-e- Annihilation

Phys. Rev. Lett. 35, 1489 – Published 1 December 1975
M. L. Perl et al.


We have found events of the form e++e-e±+μ+missing energy , in which no other charged particles or photons are detected. Most of these events are detected at or above a center-of-mass energy of 4 GeV. The missing-energy and missing-momentum spectra require that at least two additional particles be produced in each event. We have no conventional explanation for these events.

DOI: http://dx.doi.org/10.1103/PhysRevLett.35.1489

  • Received 18 August 1975
  • Published in the issue dated 1 December 1975

© 1975 The American Physical Society

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