Evidence for Light Scalar Resonances in Charm Meson Decays from Fermilab E791

A. J. Schwartz

From Dalitz-plot analyses of $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ and $D^{+}\to K^{-}{\pi }^{+}{\pi }^{+}$ decays, we find evidence for light and broad scalar resonances sigma(500) and kappa(800). From a Dalitz-plot a…