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.
@article{arxiv.1009.0155,
title = {Branching fraction of the isospin violating process phi to omega pi0},
author = {C. Z. Yuan and X. H. Mo and P. Wang},
journal= {arXiv preprint arXiv:1009.0155},
year = {2011}
}