The Δ(1232) partial width anomaly (2|r|>Γ) arises naturally from S-matrix unitary mixing, shown via a heuristic elastic model treating the Δ(1600) as fully elastic.
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Lattice QCD calculation of branching ratios and form factors for π and K → ℓνℓγ decays at physical pion mass with IVR method, showing agreement with PIBETA for π→eνeγ and tensions with some kaon data.
Virtual contributions from the tails of rho(770) and omega(782) are comparable to those from their excited states rho(1450,1700) and omega(1420,1650) in B to eta(') K Kbar decays.
Residue phase θ of light hadron resonances is primarily determined by geometric phase δ₀ from the threshold, with vector resonances aligning closely and scalars showing 10-15° deviations attributed to Adler zeros.
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