Another look at ππ scattering in the scalar channel
Keiji Igi, Ken-ichi Hikasa
Abstract
We set up a general framework to describe ππ scattering below 1 GeV based on chiral low-energy expansion with possible spin-0 and 1 resonances. Partial wave amplitudes are obtained with the N/D method, which satisfy unitarity, analyticity and approximate crossing symmetry. Comparison with the phase shift data in the J=0 channel favors a scalar resonance near the ρ mass.
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