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The Third Mixing Angle

We show that the Hidden Local Symmetry Model, supplemented with well-known procedures for breaking flavor SU(3) and nonet symmetry, provides all the information contained in the standard Chiral Perturbation Theory (ChPT) Lagrangian L (0) + L (1) . This allows to rely on radiative decays of light mesons (V P and P) in order to extract some numerical information of relevance to ChPT: a value for �1 = 0.20 ± 0.04, a quark mass ratio of ≃ 21.2 ± 2.4, and a negligible departure from the Gell-Mann–Okubo mass formula. The mixing angles are �8 = −20.40 ◦ ±0.96 ◦ and �0 = −0.05 ◦ ±0.99 ◦ . We also give the values of all decay constants. It is shown that the common   