Precision Study of η′→γπ+π− Decay Dynamics

Using a low background data sample of 9.7×105  J/ψ→γη′, η′→γπ+π− events, which are 2 orders of magnitude larger than those from the previous experiments, recorded with the BESIII detector at BEPCII, the decay dynamics of η′→γπ+π− are studied with both model-dependent and model-independent approaches. The contributions of ω and the ρ(770)−ω interference are observed for the first time in the decays η′→γπ+π− in both approaches. Additionally, a contribution from the box anomaly or the ρ(1450) resonance is required in the model-dependent approach, while the process specific part of the decay amplitude is determined in the model-independent approach.