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. A comparison with the phase shift data in the J=0 channel favors a scalar resonance near the ρ mass.
|Number of pages||9|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 1999 Feb 1|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)