Abstract
Values of the ππ scattering lengths and low-energy phase shifts are tabulated corresponding to various assumptions on the mass and width of the sigma meson. The method uses forward and first derivative dispersion relations. The I = 0 S-wave scattering length a o comes out in the range −0.3 to 0.6 m π −1. The P-and D-wave scattering lengths are relatively independent of the sigma parameters. Solutions are compared with results on Ke 4 decay and with the predictions of current algebra. Super broad sigmas seem to be preferred. Such solutions are also more self consistent in a bootstrap sense.
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