Precision Study of η′ →γπ+π- Decay Dynamics

The BELLE collaboration

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18 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number242003
Number of pages8
JournalPhysical Review Letters
Volume120
Issue number24
DOIs
Publication statusPublished - 14 Jun 2018

Keywords

  • INITIAL-STATE RADIATION
  • KLOE DETECTOR
  • CROSS-SECTION
  • FORM-FACTOR
  • RHO-MESON
  • COLLISIONS
  • WIDTH
  • PI(+)PI(-))
  • ETA'(958)
  • E(+)E(-)

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