Precision Study of η
Phys Rev Lett
; 120(24): 242003, 2018 Jun 15.
Article
en En
| MEDLINE
| ID: mdl-29956981
ABSTRACT
Using a low background data sample of 9.7×10^{5} J/ψâγη^{'}, η^{'}âγπ^{+}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^{'}âγπ^{+}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^{'}âγπ^{+}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.
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Phys Rev Lett
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2018
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Article