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The three body decays $B \to D^{(*)} \bar{D}^{(*)} K_s$ may be used tomeasure both $\sin{2\beta}$ and $\cos{2\beta}$. Crucial to the $\cos{2\beta}$measurement is the resonant contribution to the three body decay from p-waveexcited $D_s$ states. If these p-wave states are the newly discovered$D_s(2317)$ and $D_s(2460)$ then they are below the $D^{(*)} K$ threshold andhence do not contribute to $B \to D^{(*)} \bar{D}^{(*)} K_s$. The three bodydecays can then be used to measure $\sin{2\beta}$ without resonant dilution andto look for new physics in $ b \to c \bar{c} s $ transition.Comment: 11 pages, no figures, Talk presented at MRST 200

EXTRACTING β AND THE NEW DSJ RESONANCES

EXTRACTING β AND THE NEW D_SJ RESONANCES