Precision Study of $\eta^\prime\rightarrow\gamma\pi^+\pi^-$ 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.

Note:

7 pages, 4 figures, 1 tables

electron positron: annihilation
electron positron: colliding beams
J/psi(3100): electroproduction
J/psi(3100): radiative decay
eta(958): radiative decay
background: low
Beijing Stor
interference
omega(783)
rho(1450)

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