Light Mesons from Charm Meson Decays in FNAL E791

Abstract

An analysis of the Dalitz plots for the decays $D^{+}\to K^{-}{\pi }^{+}{\pi }^{+}$ and $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ indicates that structure with significant phase variation is required in the s-wave $K^{-}{\pi }^{+}$ and ${\pi }^{-}{\pi }^{+}$ systems in the region below 1 GeV/c${}^2$ effective mass. A constant, non resonant "contact" term, together with a simple s-wave Breit Wigner amplitude with $M_0=797\pm 19\pm 43,{\Gamma }_0=175\pm 12\pm 12$ MeV/c${}^2$ for the $\Km\pip$ system and $M_0=478_{-23}^{+24}\pm 17,{\Gamma }_0=324_{-40}^{+42}\pm 21$ MeV/c${}^2$ for the ${\pi }^{-}{\pi }^{+}$ system provide good fits to the data in this region.

4 pages, 2 figures, Moriond QCD conference, 2002