2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42751An old calculation of the s-wave pi-pi scattering lengths is updated and supplemented with experimental data on the pi-pi s-wave phase shift. The results ma0 = .215 and ma2 = -.039 are in excellent agreement with those obtained from a recent analysis of the results published by the Brookhaven E865 collaboration.8 pagesHigh Energy Physics - Phenomenologytext