We have found events of the form , 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.
- Received 18 August 1975
- Published in the issue dated 1 December 1975
© 1975 The American Physical Society