
TL;DR
This paper presents a simple, causal, and analytic rescattering model that accurately describes exotic charmonium-like resonances $Z_c(3900)$ and $Z_c(4025)$ without requiring poles in the scattering matrix.
Contribution
The paper introduces a novel rescattering model that explains exotic resonances without invoking poles, offering a new perspective on their nature.
Findings
Model accurately fits experimental data
No poles needed in the scattering matrix
Provides a causal and analytic description
Abstract
A simple, causal, and analytic model of final state rescattering is used to describe all available data on the exotic resonances and . The model provides a compelling and accurate representation of experiment with no need for poles in the scattering matrix.
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