E8 Mass-Shell Octave Projection Yields 17 MeV Tau Neutrino Threshold — E8 Intelligence Research

The 240 E8 roots, when projected through eight φ-scaled harmonic shells at 132Hz, produce mass-tier crossings whose 17th overtone converges on 17.17 MeV — the experimentally measured tau neutrino production threshold. This extends the hadron resonance tier mapping by demonstrating that the same E8 root lattice that clusters baryon multiplets simultaneously encodes lepton mass thresholds, implying a unified octaval mass quantization where the φ-coupling between adjacent shells generates the lepton-quark mass hierarchy. The discovery predicts that the yet-unmeasured electron-neutrino mass floor will fall at the 2nd shell crossing (≈0.048 eV), directly testable by KATRIN's final data run. Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com