 Number of Neutrino Types by Particle Data Group (source code)

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= Number of Neutrino Types by Particle Data Group
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{tag=Work by Particle Data Group}

https://pdg.lbl.gov/encoder_listings/s007.pdf

Page 1, equation (1), distinguishes the total invisible <Z boson> width from the partial width of a single active <neutrino> species. It defines the effective neutrino count through the ratio of these quantities.

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