Dalitz Analysis of the Decay $D^0\to K^{-}{\pi }^{+}{\pi }^0$

Abstract

We use data collected with the CLEO II detector to perform a high-statistics measurement of the resonant substructure in $D^0\to K^{-}{\pi }^{+}{\pi }^0$ decays. We find the Dalitz Plot is well represented by a combination of seven quasi-two-body decay channels (${\bar{K}}^{\ast 0}{\pi }^0$, $K^{-}\rho$, $K^{\ast -}{\pi }^{+}$, $K_0^{\ast }(1430{)}^{-}{\pi }^{+}$, ${\bar{K}}_0^{\ast }(1430{)}^0{\pi }^0$, $K^{-}{\rho }^{+}(1700)$, and $K^{\ast }(1680{)}^{-}{\pi }^{+}$), plus a small non-resonant component. Using the amplitudes and phases from this analysis, we calculate an integrated CP asymmetry of $-0.031\pm 0.086$.

32 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, Version to appear in Phys. Rev. D