An improved pion-pion dispersive fit with G-waves and forward dispersion relations up to 1.6 GeV yields stable resonance poles and no rho(1250) signal.
Hyams et al.,A study of all the ππ phase shift solutions in the mass region 1.0 GeV to 1.8 GeV fromπβπβπβπ+π at 17.2 GeV, Nucl
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Improving $\pi\pi$ dispersive analyses and resonance determination with Forward Dispersion Relations
An improved pion-pion dispersive fit with G-waves and forward dispersion relations up to 1.6 GeV yields stable resonance poles and no rho(1250) signal.