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The pi pi Phase Shifts from psi' to J/psi pi^+ pi^- Decays

Feng-Kun Guo·Peng-Nian Shen·Huan-Qing Jiang
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Abstract

The $ψ'\to J/ψπ^+π^-$ decay process provides a new way to extract the $ππ$ $S$ wave phase shifts up to $0.59GeV$. In this paper we derive the formulae for extracting the $ππ$ $S$ wave phase shifts from the invariant mass spectrum of $ππ$ in the $ψ'\to J/ψπ^+π^-$ decay.

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Feng-Kun Guo, Peng-Nian Shen, Huan-Qing Jiang. 2006-05-23. The pi pi Phase Shifts from psi' to J/psi pi^+ pi^- Decays. https://arxiv.org/abs/hep-ph/0601082

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