IV.D28 — Weinberg Near-Match

Weinberg angle near-match: κ(A,D) = ι_τ(1−ι_τ) ≈ 0.2249 vs sin²θ_W = 0.23121 (CODATA 2022). Deviation ~2.7%. τ-approximation undershoots. Range proof: κ(A,D) ∈ (0.224, 0.226).