We discuss some aspects of the search for CP asymmetry in the three body B decays, revealed through the interference among neighbor resonances in the Dalitz plot. We propose a competitive method to extract the CKM $\gamma$ angle combining Dalitz plot amplitude analysis of $B^{ \pm} \to K^{ \pm} \pi^+ \pi^-$ and untagged $B^0$, $\bar B^0 \to K_s \pi^+ \pi^-$. The method also obtains the ratio and phase difference between the { \it tree} and { \it penguin} contributions from $B^0$ and $\bar B^0 \to K^{ *\pm} \pi^{ \mp} $ decays and the CP asymmetry between $B^0$ and $\bar{ B^0}$. From Monte Carlo studies of 100K events for the neutral mesons, we show the possibility of measuring $\gamma$.
Categories: hep-ph hep-ex