Çetin, Serkant Ali2020-06-292020-06-292018-06-141079-71140031-9007https://hdl.handle.net/11411/2299https://doi.org/10.1103/PhysRevLett.120.242003Using a low background data sample of 9.7 x 10(5) J/psi -> gamma eta',eta' -> gamma pi(+)pi(-) 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 eta' -> gamma pi(+)pi(-) are studied with both model-dependent and model-independent approaches. The contributions of. and the rho(770)-omega interference are observed for the first time in the decays eta' -> gamma pi(+)pi(-) in both approaches. Additionally, a contribution from the box anomaly or the rho(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.eninfo:eu-repo/semantics/openAccessINITIAL-STATE RADIATIONKLOE DETECTORCROSS-SECTIONFORM-FACTORRHO-MESONCOLLISIONSWIDTHPI(+)PI(-))ETA'(958)E(+)E(-)Article2-s2.0-8504855331110.1103/PhysRevLett.120.24200329956981Q1WOS:000435336200004