Abstract
We extend a recent non-perturbative chiral approach to ππ S-wave scattering of Oiler and Oset by including the couplings to the ηη-channel. We find that the isospin-zero and isospin-two ππ-wave phase shifts of the model deviate considerably from a recent solution of the Roy-equations. Including the couplings with the ηη-channel does not improve the situation. In particular, no σ-meson like enhancement structure shows up in the Roy-equation solution. We also consider the ππ-scattering lengths in this approach.
Original language | English |
---|---|
Pages (from-to) | 307-309 |
Number of pages | 3 |
Journal | European Physical Journal A |
Volume | 3 |
Issue number | 4 |
DOIs | |
State | Published - 1998 |