We have observed events of the form e++e- → e++e- and e++e- → μ++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++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.
ASJC Scopus subject areas
- Nuclear and High Energy Physics