SU(3) Symmetry in Electron-Positron Annihilation

Exact SU(3) predicts equal production of ${\pi }^{+}{\pi }^{-}$ and $K^{+}{K}^{-}$ final states, while $K^0{\overline{K}}^0$ is forbidden as a result of cancelation between isovector and isoscalar photon contributions. Symmetry breaking destroys coherence between $p$-, $\omega$-, and $\varphi$-like photon components. Branching ratios $\frac{\frac{{\pi }^{+}{\pi }^{-}}{K^{+}{K}^{-}}}{\frac{K^0}{{\overline{K}}^0}}$ calculated under various coherence assumptions give different results. Experimental measurements should test this interference and give insight into the role of photon SU(3) structure in deep annihilation.