Elastic ππ scattering to two loops
J. Bijnens, G. Colangelo, G. Ecker, J. Gasser, M. E. Sainio
Abstract
We evaluate analytically the elastic ππ scattering amplitude to two loops in chiral perturbation theory and give numerical values for the two S--wave scattering lengths and for the phase shift difference δ00-δ11.
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