The study predicts branching ratios for the decay of ρ^0 to four pions, indicating various theoretical frameworks.
The ρ^0->π^+π^-π^+π^- branching ratio is predicted to be (0.5+-0.1) x 10^-4, (1.7+-0.2) x 10^-4 and (4.0+-0.5) x 10^-4 in the 'Hidden Symmetry' scheme, conventional Vector-Meson Dominance and the 'Massive Yang-Mills' approach, respectively. The corresponding experimental upper bound is 2 x 10^-4.
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A. et al. (1993) studied this question.
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