Speaker
Description
The precise measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle $\phi_{3}$ plays a crucial role in testing the consistency of the standard model (SM) description of $CP\!$ violation. The determination of $\phi_{3}$ with $B^-\to D^{(*)}K^-$ decays is theoretically robust, free from loop-level contributions, making it an ideal benchmark for comparison with beyond-the-SM-sensitive measurements. In this talk, we present a measurement of $\phi_{3}$ using a model-independent Dalitz plot analysis of the decay $B^{\pm} \rightarrow D^{*}(D\gamma/\pi^{0})h^{\pm}$, with $D \rightarrow K_{s}^{0}\pi^{+}\pi^{-}$. The decays of $D^{}$ to $D\gamma$ and $D\pi^{0}$ are reconstructed both—exclusively, where the neutral pion or photon is explicitly identified—and partially, where the neutral pion or photon is not included. The combined Belle and Belle II data set is used.
| Field of contribution | Experiment |
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