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Conference papers

Roy's equations and the pion-pion experimental data

Abstract : Roy's equations are used to check if the scalar-isoscalar pion-pion scattering amplitudes fitted to experimental data fulfill crossing symmetry conditions. It is shown that the amplitudes describing the "down-flat'' phase shift solution satisfy crossing symmetry below 1 GeV while the amplitudes fitted to the "up-flat'' data do not. In this way the long standing "up-down" ambiguity in the phenomenological determination of the scalar-isoscalar pion-pion amplitudes has been resolved confirming the independent result of the recent joint analysis of the pi+pi- and pi0pi0 data.
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http://hal.in2p3.fr/in2p3-00150312
Contributor : Dominique Girod <>
Submitted on : Wednesday, May 30, 2007 - 9:49:18 AM
Last modification on : Friday, April 10, 2020 - 5:23:39 PM

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R. Kaminski, L. Lesniak, B. Loiseau. Roy's equations and the pion-pion experimental data. Tenth International Conference on Hadron Spectroscopy (Hadron'03), Aug 2003, Aschaffenburg, Germany. pp.195-199, ⟨10.1063/1.1799704⟩. ⟨in2p3-00150312⟩

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