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Analysis of f0 interference in photon spectrum reveals new insights into f0 nature, indicating potential for further research.
We present in this paper a complete study of the physical backgrounds, coherent and incoherent, in the 20-100 MeV photon spectrum from e^+e^-→π^+π^-γ at the ϕ peak, of relevance to ϕ→f_0 γ→π^+ π^- γ. Continuum contributions are suppressed by suitable kinematics and angular cuts. We show that we can determine the sign of the ϕf_0 γ coupling even for the smallest branching ratio expected for ϕ→f_0γ, thus have the promise of a totally new piece of information on the nature of the f_0.
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L. et al. (1992) studied this question.
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