New graph-neural-network flavor tagger for Belle II and measurement of $\sin 2\ddot{I}{•}_1$ in $B^0\to J/\ddot{I}ˆK_{\text{S}}^0$ decays

Belle II Collaboration, I. Adachi, L. Aggarwal +413

We present GFlaT, a new algorithm that uses a graph-neural-network to determine the flavor of neutral $B$ mesons produced in $\hat{I}\yen (4S)$ decays. It improves previous algorithms by usi…