Samenvatting
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.
Originele taal-2 | English |
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Artikelnummer | 242003 |
Aantal pagina's | 8 |
Tijdschrift | Physical Review Letters |
Volume | 120 |
Nummer van het tijdschrift | 24 |
DOI's | |
Status | Published - 2018 |