A unified quark-hadronic framework for the ρ resonance determines its bare mass from refitted narrow-meson parameters and extracts the ππ coupling from phase-shift data to compute the physical width and bare-state fraction.
Machleidt, The Meson theory of nuclear forces and nuclear structure, Adv
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How to understand $\rho$ Resonance from the Quark Model and $\pi\pi$ $P$-wave phase shift
A unified quark-hadronic framework for the ρ resonance determines its bare mass from refitted narrow-meson parameters and extracts the ππ coupling from phase-shift data to compute the physical width and bare-state fraction.