We examine the parametrization of the e+e- -> omega pi0 cross section in the vicinity of the phi resonance and the extraction of the branching fraction of the isospin violating process phi -> omega pi0 from experimental data. We found that there are two possible solutions of the branching fraction, one is 4 times 10^{ -5}, and the other is 7 times 10^{ -3}. The latter is two orders of magnitude higher than the former, which is the commonly accepted one.
Categories: hep-ex hep-ph