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Precision Study of η′→γπ+π− Decay Dynamics
- Source :
- Physical Review Letters. 120
- Publication Year :
- 2018
- Publisher :
- American Physical Society (APS), 2018.
-
Abstract
- 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.
- Subjects :
- Physics
Rho meson
010308 nuclear & particles physics
Electron–positron annihilation
Background data
Form factor (quantum field theory)
General Physics and Astronomy
Resonance
01 natural sciences
Amplitude
Orders of magnitude (time)
0103 physical sciences
Anomaly (physics)
Atomic physics
010306 general physics
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 120
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi...........1534da694bc380b4af6dd404a4f0e16c