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- W2225737534 abstract "The Roy equations determine the S- and P-wave pion-pion phase shifts on a low energy interval. They allow the derivation of threshold parameters from experimental data. We examine the solutions of these equations that are in the neighborhood of a given solution by means of a linearization procedure. An updated survey of known results on the dimension of the manifold of solutions is presented. The solution is unique for a low energy interval with upper end at 800 MeV. We determine its response to small variations of the input: S-wave scattering lengths and absorptive parts above 800 MeV. We confirm the existence of a universal curve of solutions in the plane of the S-wave scattering lengths and provide a control of the decrease of the influence of the input absorptive parts with increasing energy. A general result on the suppression of unphysical singularities at the upper end of the low energy interval is established and its practical implications are discussed." @default.
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- W2225737534 date "2000-10-01" @default.
- W2225737534 modified "2023-09-23" @default.
- W2225737534 title "The role of the input in Roy's equations for $pi -pi$ scattering" @default.
- W2225737534 doi "https://doi.org/10.1007/s100520000459" @default.
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