Precision Study of η′ → γπ<SUP>+</SUP> π<SUP>-</SUP> Decay Dynamics


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Ablikim M., Achasov M. N., Ahmed S., Ai X. C., Albayrak O., Albrecht M., ...More

PHYSICAL REVIEW LETTERS, vol.120, no.24, 2018 (SCI-Expanded) identifier identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 120 Issue: 24
  • Publication Date: 2018
  • Doi Number: 10.1103/physrevlett.120.242003
  • Journal Name: PHYSICAL REVIEW LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Bursa Uludag University Affiliated: No

Abstract

Using 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.