Elimination of Ambiguities in pi-pi Amplitudes Using Roy's Equations

Details Elimination of Ambiguities in pi-pi Amplitudes Using Roy's Equations Elimination of Ambiguities in pi-pi Amplitudes Using Roy's Equations

2002-07-04

arxiv.org/abs/hep-ph/0207063v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure, talk given at the Seventh Int. Workshop Meson 2002, Cracow, Poland, May 24-28, 2002

Scientific paper

Roy's equations are used to check if scalar-isoscalar pi-pi amplitudes fitted to the ``up-flat'' and ``down-flat'' phase shift solutions fulfill crossing symmetry below 1 GeV. It is shown that the amplitude fitted to the ``down-flat'' solution satisfies crossing symmetry while the ``up-flat'' one does not. In such a way the ``up-down'' ambiguity in the scalar-isoscalar phase shifts is resolved in favour of the ``down-flat'' solution.

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