Number from ${{\boldsymbol e}^{+}}{{\boldsymbol e}^{-}}$ Colliders

Number of Light ${{\boldsymbol \nu}}$ Types INSPIRE search

VALUE DOCUMENT ID TECN
$2.9840$ $\pm0.0082$ 1
LEP-SLC
2006
RVUE
• • • We do not use the following data for averages, fits, limits, etc. • • •
$3.00$ $\pm0.05$ 2
LEP
1992
RVUE
1  Combined fit from ALEPH, DELPHI, L3 and OPAL Experiments.
2  Simultaneous fits to all measured cross section data from all four LEP experiments.
  References:
LEP-SLC 2006
PRPL 427 257 Precision Electroweak Measurements on the ${{\mathit Z}}$ Resonance
LEP 1992
PL B276 247 Electroweak Parameters of the ${{\mathit Z}^{0}}$ Resonance and the Standard Model