Speaker
Description
The Belle and Belle II experiments have collected a $1.2~\mathrm{ab}^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at a center-of-mass energy corresponding to the $\Upsilon(4S)$ resonance. We present measurements of the ratios for exclusive $B\to D^{(*)}\ell \nu$ decays $R(D^{(*)})$ in decays where the other $B$ in the event is reconstructed in hadronic or semileptonic final states. We also present recent results on $B\to K^{(*)}\nu\bar{\nu}$ using an inclusive tagging technique, including the first results from Belle. We will also present a search for inclusive decays $B\to X_s\nu\bar{\nu}$, where $X_s$ is a hadronic system with strangeness. We will also present searches for the decays $B^+\to K^+\tau^+\tau^-$ and $B^0\to K^0_S\tau^+\tau^-$. The asymmetric-energy SuperKEKB collider provides a boost to the $B$ mesons in the laboratory frame, allowing measurements of time-dependent $C\!P$ violation. We present measurements of time-dependent $C\!P$ violation in both hadronic and radiative penguin $B$ decays, including measurements of the $C\!P$ asymmetries in $B\to \eta' K^0$, and the radiative decays $B\to \rho^0\gamma$ and $B\to K^0 \pi^0 \gamma$.
| Are you an early career researcher? | No |
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