A quark-model calculation links the rho meson mass shift to its two-pion decay width, but the reported agreement with experiment comes from tuning two model parameters.
(11) For the decay ρ → ππ, the two pions are on shell and we have p2 1 = p2
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$ \rho\to \pi\pi $ Hadronic Decay in the Nambu-Jona-Lasinio Model: Mass-Width Interplay and Beyond-RPA Corrections
A quark-model calculation links the rho meson mass shift to its two-pion decay width, but the reported agreement with experiment comes from tuning two model parameters.