Branching fraction of the isospin violating process φ → ωπ⁰

Abstract：

We have examined the parametrization of the e⁺e^- → ωπ⁰ cross section in the vicinity of the φ resonance and the extraction of the branching fraction of the isospin violating process φ → ωπ⁰ from experimental data. We found that there are two possible solutions of the branching fraction: one is 4 × 10^-5, and the other is 7 × 10^-3. The latter is two orders of magnitude higher than the former, which is the commonly accepted one.