What question did this study set out to answer?

This research aims to predict the branching ratio for the decay of ρ^0 to π^+π^-π^+π^- using different theoretical frameworks.

March 5, 2026Open Access

The ρ⁰->π^+π^-π^+π^- Decay in Effective Lagrangians Incorporating Vector-Mesons

Key Points

This research aims to predict the branching ratio for the decay of ρ^0 to π^+π^-π^+π^- using different theoretical frameworks.
Utilized effective lagrangians incorporating vector-mesons.
Analyzed three theoretical approaches: Hidden Symmetry, Vector-Meson Dominance, and Massive Yang-Mills.
Calculated branching ratios in each approach.
Predicted branching ratio for Hidden Symmetry: (0.5±0.1) x 10^-4.
Predicted branching ratio for Vector-Meson Dominance: (1.7±0.2) x 10^-4.
Predicted branching ratio for Massive Yang-Mills: (4.0±0.5) x 10^-4.
Experimental upper bound found to be 2 x 10^-4.

Abstract

The ρ⁰->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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