pi-pi scattering amplitudes constrained by Roy's equations

Details pi-pi scattering amplitudes constrained by Roy's equations pi-pi scattering amplitudes constrained by Roy's equations

2005-10-17

arxiv.org/abs/hep-ph/0510218v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, talk presented at 12th International QCD Conference (QCD05) 4-9th July 2005 Montpellier (France), to appear in Nucl.

Scientific paper

The scalar-isoscalar, scalar-isotensor and vector-isovector pi-pi amplitudes have been fitted simultaneously to experimental data and to to Roy's equations. Resulting pi-pi phase shifts up to 1600 MeV and near threshold observables have been analyzed. Only the amplitudes fitted to the "down-flat" set of phase shifts in scalar-isoscalar wave fulfill crossing symmetry conditions and can be regarded as physical.

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