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      Precision Study of \({\eta }^{\prime }\to \gamma {\pi }^{+}{\pi }^{-}\) Decay Dynamics

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      Physical Review Letters
      American Physical Society (APS)

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          Abstract

          <p class="first" id="d4200972e4093">Using a low background data sample of 9.7×10^{5}  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. </p>

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          Journal
          PRLTAO
          Physical Review Letters
          Phys. Rev. Lett.
          American Physical Society (APS)
          0031-9007
          1079-7114
          June 2018
          June 14 2018
          : 120
          : 24
          Article
          10.1103/PhysRevLett.120.242003
          29956981
          8f027ebc-96e2-49cf-aa2c-fe3d0e1aa8d2
          © 2018

          https://creativecommons.org/licenses/by/4.0/

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