Dai_etal2018 ArticleInAPeriodical Amer Physical Soc 2018 Physical Review D 97 3 http://arxiv.org/abs/1712.02119 http://arxiv.org/abs/1712.02119 https://doi.org/10.1103/PhysRevD.97.036012 036012-12pp DaiLY KangXW MeissnerUG SongXY YaoDL Amplitude analysis of the anomalous decay eta ' -> pi(+) pi(-) gamma In this paper we perform an amplitude analysis of eta ' -> pi(+)pi(-)gamma and confront it with the latest BESIII data. Based on the final-state interaction theorem, we represent the amplitude in terms of an Omnes function multiplied by a form factor that corresponds to the contributions from left-hand cuts and right-hand cuts in the inelastic channels. We also take into account the isospin violation effect induced by rho-omega mixing. Our results show that the anomaly contribution is mandatory in order to explain the data. Its contribution to the decay width of Gamma(eta ' -> pi pi gamma) is larger than that induced by isospin violation. Finally we extract the pole positions of the rho and omega as well as their corresponding residues.WOS:000424904000003exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3489), last updated on Mon, 26 Feb 2018 15:49:10 +0000