Another look at $ππ$ scattering in the scalar channel
Abstract
Description
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.
17 pages, 5 figures, REVTeX
17 pages, 5 figures, REVTeX