Combined measurement of CP violating angle $\beta$ by the BaBar and Belle experiments

We present a recent joint measurement of CP violating angle $\beta$ using 1.1 inverse attobarn data collected by BaBar and Belle experiments. This analysis is based on a time-dependent Dalitz plot analysis of $B \to \D^{(*)} h^{0}$ with $D \to K_{S}^{0} \pi^{+} \pi^{-}$ decays. These decays provide an experimental access to $\cos{2\beta}$ in addition to $\sin(2\beta)$, and can therefore resolve an ambiguity in the determination of the apex of the CKM Unitarity Triangle. As part of the analysis, a full Dalitz plot amplitude analysis of $D \to K_{S}^{0} \pi^{+} \pi^{-}$ is performed on a high-statistics charm data set. The first evidence for $\cos 2\beta >0$, an observation of CP violation, and the exclusion of the second solution of the CKM Unitarity Triangle of $\beta=(68.1 +- 0.7)^\circ$ at a significance of 7.3 standard deviations are reported.