QCD PARAMETRIZATION OF THE RHO-GAMMA, OMEGA-GAMMA AND PHI-GAMMA COUPLINGS - WHY F-RHO-GAMMA-F-OMEGA-GAMMA=3-1 IN SPITE OF FLAVOR BREAKING

A quasi no flavor breaking theorem, derived from QCD for a class of hadronic states, is used to show that the ratio of rhogamma to omegagamma coupling - for ideal omega - phi mixing-is almost (to a part in 10(2)) unaffected by flavor breaking, and, therefore, equal to 3. On the other hand the ratio of rhogamma to phigamma coupling, (not governed by the theorem) must differ, due to flavor breaking, from the unbroken SU3 value (3/ square-root 2). The data are consistent with these predictions. As a byproduct we determine the small deviation delta theta(v) almost-equal-to -3-degrees of the mixing vector angle from the ideal value (35.3-degrees), including its sign, that turns out to be negative (opposite to the positive traditional value based on an approximate mass analysis). The derivation of the quasi no flavor breaking theorem is based, as shown in a previous paper, on the method of general parametrization. It exploits the simple SU3 (flavor) structure of the QCD Lagrangian. We note some consequences of the theorem relevant to the equivalence to QCD of certain effective Lagrangian theories and models.