摘要
In our 1988 edition, we replaced the ρ（1600） entry with two new ones, the ρ（1450） and the ρ（1700）, because there was emerging evidence that the 1600-MeV region actually contains two ρ-like resonances. Erkal [1] had pointed out this possibility with a theoretical analysis on the consistency of 2π and 4π electromagnetic form factors and the ππ scattering length. Donnachie [2],
In our 1988 edition, we replaced the ρ（1600） entry with two new ones, the ρ（1450） and the ρ（1700）, because there was emerging evidence that the 1600-MeV region actually contains two ρ-like resonances. Erkal [1] had pointed out this possibility with a theoretical analysis on the consistency of 2π and 4π electromagnetic form factors and the ππ scattering length. Donnachie [2],
