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Number of Neutrino Types by Particle Data Group
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Physics
Physics bibliography
2026-10-24
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Work by Particle Data Group
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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(3)
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Past exam of the sub-atomic physics course of the University of Oxford
/
2016
/
4
/
e
/
Solution
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