Precision Study of η′ → γπ⁺π⁻ Decay Dynamics
Date
2018-11-05
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Journal ISSN
Volume Title
Publisher
American Physical Society
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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.
Description
Includes supplementary material
Keywords
Nuclear physics, Pions, J/ψ (J/psi) meson, Mass (Physics), Radioactive decay, Photons
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Rights
CC BY 4.0 (Attribution), ©2017 The Authors.