The pi pi Phase Shifts from psi' to J/psi pi^+ pi^- Decays
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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.
7 pages, 1 figure. A misprint in Eq.(13) corrected
7 pages, 1 figure. A misprint in Eq.(13) corrected