A study of single photon events, produced in association with light neutrinos or other weakly interacting neutral particlaes in e+e- collisions, has been performed at √s=54.0-61.4 GeV with the VENUS detector at TRISTAN. No anomalous signal has been observed in a data sample corresponding to an integrated luminosity of 28.2 pb-1. This result indicates that the upper limit on the number of light neutrinos, Nν, is 11 (15) at a 90 (95)% confidence level. Combining this with published results from other e+e- experiments, the number of light neutrinos is limited to Nν<3.9(4.8) at the 90 (95)% confidence level. Limits are also placed on the mass of supersymmetric particles.
|Number of pages||6|
|Journal||Physics Letters B|
|Publication status||Published - 1989 Dec 7|
ASJC Scopus subject areas
- Nuclear and High Energy Physics