Ablikim, M.Achasov, M. N.Ahmed, S.Ai, X. C.Albayrak, O.Albrecht, M.Lou, XinchouBESIII Collaboration2018-11-052018-11-052018-06-142018-11-050031-9007http://hdl.handle.net/10735.1/6260Includes supplementary materialUsing 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.enCC BY 4.0 (Attribution)©2017 The Authors.http://creativecommons.org/licenses/by/4.0/Nuclear physicsPionsJ/ψ (J/psi) mesonMass (Physics)Radioactive decayPhotonsarticleAblikim, M., M. N. Achasov, S. Ahmed, X. C. Ai, et al. 2018. "Precision study of η′ →γπ⁺π⁻ decay dynamics." Physical Review Letters 120(24), 242003(1)-242003(8), doi:10.1103/PhysRevLett.120.24200312024