Fixing two chiral perturbation theory parameters by fitting pion-pion phase shifts
Abstract
In this paper, we fix the parameters l1 and l2 of the one loop corrected chiral perturbation theory by fitting the low energy pion-pion S- and P- experimental phase-shifts. The corresponding values of the scattering lengths are calculated. Related approaches for data fitting, in particular the unitarization program of current algebra, are also discussed.
- Publication:
-
Physics Letters B
- Pub Date:
- February 1997
- DOI:
- 10.1016/S0370-2693(96)01646-2
- Bibcode:
- 1997PhLB..393..413S