Three Neutrino Families
1989Precision measurement of the invisible decay width of the Z boson at LEP established that there are exactly 3 light neutrino species (N_v = 2.98 +/- 0.06), ruling out a hypothetical fourth generation of light neutrinos/leptons. Multiple LEP collaborations (ALEPH, DELPHI, L3, OPAL) published closely related results starting in 1989; this node anchors to the earliest of that series.
Discovery Velocity
Normalized OpenAlex paper velocity, one point per year.
Originators
- LEP Collaborations (ALEPH, DELPHI, L3, OPAL)
Landmark Paper
Checked 2026-08-30 — interim signal only, see docs/BASIC_ROADMAP.md Phase 10
Connections
No verified edges into the applied tree or elsewhere in Basic yet — never rendered as fabricated, just absent.
Cross-Domain Connections
No verified cross-domain connections indexed for Three Neutrino Families yet. Verified links are admitted under FSTP epistemic audit standards.