Exclusion of multifold solutions of the CKM Unitarity Triangle by a time-dependent Dalitz plot analysis of ${\bar{B}}^0\to D^{(\ast )0}{h}^0$ with $D^0\to K_S^0{\pi }^{+}{\pi }^{-}$ decays combining BABAR and Belle data

Abstract

We present results of a new analysis campaign, which combines the final data samples collected by the B factory experiments BABAR and Belle in single physics analyses to achieve a unique sensitivity in time-dependent \CP\ violation measurements. The data samples contain $(471\pm 3)\times 10^{6}B\bar{B}$ pairs recorded by the BABAR detector and $(772\pm 11)\times 10^{6}B\bar{B}$ pairs recorded by the Belle detector in $e^{+}{e}^{-}$ collisions at the center-of-mass energies corresponding to the mass of the ${\rm Y}(4S)$ resonance at the asymmetric-energy $B$ factories PEP-II at SLAC and KEKB at KEK, respectively. We present a measurement of $\sin 2\beta$ and $\cos 2\beta$ by a time-dependent Dalitz plot analysis of $B^0\to D^{(\ast )}{h}^0$ with $D\to K_S^0{\pi }^{+}{\pi }^{-}$ decays. A first evidence for $\cos 2\beta >0$, the exclusion of trigonometric multifold solutions of the Unitarity Triangle and an observation of \CP\ violation are reported.

9 pages, 7 figures, Talk presented at the APS Division of Particles and Fields Meeting (DPF 2017), July 31-August 4, 2017, Fermilab. C170731