How to avoid ΔY = 1 neutral currents

The problem is posed of exhibiting a mechanism that avoids Δ Y=1 neutral currents without invoking experimentally unknown types of particles. The proposed solution rejects the Cabibbo rotation in favor of a mixing, between two types of unit-spin mesons, that is produced by the SU₃-symmetry-breaking interaction. One quantitative prediction that is well satisfied is the identity of the strong-interaction coupling constants appearing in π± decay and in ρ⁰→e⁺+e⁻.