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The pi pi Phase Shifts from psi' to J/psi pi^+ pi^- Decays
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The pi pi Phase Shifts from psi' to J/psi pi^+ pi^- Decays
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The $\psi'\to J/\psi\pi^+\pi^-$ decay process provides a new way to extract the $\pi\pi$ $S$ wave phase shifts up to $0.59GeV$. In this paper we derive the formulae for extracting the $\pi\pi$ $S$ wave phase shifts from the invariant mass spectrum of $\pi\pi$ in the $\psi'\to J/\psi\pi^+\pi^-$ decay.
Forward citations
Cited by 1 Pith paper
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Role of electromagnetic corrections in the $\pi\pi$ distributions of $\psi^\prime \to J/\psi \pi \pi$
Electromagnetic corrections alter the π⁺π⁻-threshold cusp magnitude by ~2–3% in ψ′→J/ψπ⁰π⁰, so they must be included for precision extraction of S-wave ππ scattering lengths.
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