Abstract
In this paper the determination of the number of the light neutrino families, Nν, obtained from the measurement of the cross‐section of the radiative process e+e−→ννγ at LEP is discussed. The first result, Nν=3.0±0.4±0.2, (73 events) was obtained from the OPAL Collaboration. A recent measurement, Nν=3.14±0.24±0.12 (202 events) obtained by L3, is described in some detail.
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