New formula for a resonant scattering near an inelastic threshold

We show that the Flatte formula is not adequate to interpret precision data on a resonance production near an inelastic threshold. A unitary parameterization, satisfying generalized Watson's theorem for the production amplitudes, is proposed to replace the Flatte parameterization in phenomenological analyses of experimental data.Comment: 6 pages, 2 figures, contributed to SCADRON 70, Workshop on Scalar Mesons and Related Topics, February 11-16, 2008, Lisbon, Portuga