Copy full text Step from BC structure to CKM θ₁₃ ArXe Research · July 2026 · Diego Luis Tentor Derivation document 1. The result to derive θ₁₃ CKM = arcsin(3×5 / e×11²×13) = 0.201°. The factor e appears in the denominator. The question is why e — not φ, not π, not γ — and what BC process generates it.…