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.
(A16) The calculation of M1 can make use of the assumption pµ 1 M1(p1, p2) + pµ 2 M1(p2, p1) = Z d4k (2π)4 kµ s0s1s2
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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.