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

TL;DR

This study combines data from BABAR and Belle to perform a time-dependent Dalitz plot analysis of B meson decays, providing evidence for CP violation and excluding certain solutions of the CKM Unitarity Triangle.

Contribution

It is the first combined analysis of BABAR and Belle data achieving sensitivity to exclude multifold solutions of the Unitarity Triangle.

Findings

Evidence for P violation in B decays

Exclusion of trigonometric multifold solutions of the Unitarity Triangle

First combined analysis of BABAR and Belle data for this purpose

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 $\Upsilon(4S)$ 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 $B^0 \to D^{(*)} h^0$ with $D \to K^0_S \pi^+\pi^-$ 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.