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Pi-pi scattering at low energy: S-wave phase shifts and scattering lengths

V. N. Maiorov·O. O. Patarakin
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Abstract

It is shown that the linear correlation relates the S-wave phase shifts from the threshold up to dipion mass 900 MeV. By using this correlation at the solution of the Roy equations, the accuracy of determination of S-wave lengths is considerably improved. The obtained result unambiguously witnesses in favor of the standard ChPT version with large quark condensate.

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V. N. Maiorov, O. O. Patarakin. 2003-10-08. Pi-pi scattering at low energy: S-wave phase shifts and scattering lengths. https://arxiv.org/abs/hep-ph/0308162

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