SS-2: Lattice-Scale Grounding and Nucleon Structure from 600-Cell Geometry

Abstract: SS-2 anchors the CPP lattice to physical units via two convergent routes — the pion decay constant and running of the geometric coupling to the Z mass — both yielding one lattice unit = hbar c / Lambda_QCD ≈ 0.589 fm. Using this scale, the proton and neutron are modeled as hybrid tetrahedral cells of the 600-cell with quarks at vertices and an open vertex providing the binding site. The force balance between electromagnetic repulsion and color confinement (with derived string tension 243 MeV/fm) produces a distorted tetrahedron that, combined with ZBW orbit smearing, gives the proton charge radius to +5.0%, the proton magnetic moment to -0.1%, alpha_s(m_H) to +0.2%, and Lambda_QCD to +2% — all with zero fitted parameters. Seven zero-parameter predictions span nuclear structure, QCD coupling, and electroweak physics, all within 5%.