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arXiv · 0805.2780

Studies on $π^+π^-$ phase motion in the $Ψ'\to J/Ψπ^+ π^-$ process

Z. X. Zhang·J. J. Sanz-Cillero·X. Y. Shen·N. Wu·L. Y. Xiao·H. Q. Zheng
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Abstract

We propose a measurement on the elastic $ππ$ scattering phase shift difference $δ^0_0-δ^2_0$ through $Ψ'\to J/Ψπ^+ π^-$ process in future high statistics BES-III experiment. The decay amplitude is constructed with seven Lorentz invariant form-factors and is compared with their theoretical estimation. It is found that the phase shift difference can be obtained, based on a Monte Carlo study and it is expected the phase shift in the energy region between 350 MeV to 550 MeV can be measured at future BES-III.

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Z. X. Zhang, J. J. Sanz-Cillero, X. Y. Shen, N. Wu, L. Y. Xiao, H. Q. Zheng. 2008-05-19. Studies on $π^+π^-$ phase motion in the $Ψ'\to J/Ψπ^+ π^-$ process. https://doi.org/10.1103/physrevd.78.076010

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