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Elimination of ambiguities in pion-pion phase shifts using crossing symmetry

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Published Article
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Submission Date
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DOI: 10.1016/S0370-2693(02)03021-6
arXiv ID: hep-ph/0210334
Source
arXiv
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Unknown
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Abstract

Roy's equations, which incorporate crossing symmetry of the pion-pion scattering amplitudes, are used to resolve the present ambiguity between two solutions for the scalar-isoscalar phase shifts below 1 GeV. It is shown that the "down-flat" solution satisfies well Roy's equations and consequently crossing symmetry while the other solution called "up-flat" does not and thus should be eliminated.

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