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      Precision Study of \(\eta^\prime\rightarrow\gamma\pi^+\pi^-\) Decay Dynamics

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          Abstract

          Using a low background data sample of \(9.7\times10^{5}\) \(J\psi\rightarrow\gamma\eta^\prime\), \(\eta^\prime\rightarrow\gamma\pi^+\pi^-\) events recorded with the BESIII detector at BEPCII, the decay dynamics of \(\eta^\prime\rightarrow\gamma\pi^+\pi^-\) are studied with both model-dependent and -independent approaches. The contributions of \(\omega\) and the \(\rho(770)-\omega\) interference are observed for the first time 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.

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          Author and article information

          Journal
          05 December 2017
          Article
          1712.01525
          7a5495f3-8d87-4d4a-94a9-d11047bfb308

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          8 pages, 5 figures
          hep-ex

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