Speaker
Description
The Belle and Belle$~$II experiments have collected a $1.4~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. These samples contain a large number of $e^+e^-\to c\bar{c}$ events that produce charmed mesons. Direct $C\!P$ violation is searched for in $D^0\to K^0_{\rm S}K^0_{\rm S}$ decays and $D$-meson decays to a four-body final state. For the four-body decays, asymmetries in the distributions of triple and quadruple moments probe for $C\!P$ violation.
We present searches for rare flavour-changing neutral current $c\to u\ell^+\ell^-$ processes in several decay modes. Further, we study several decays of the $\Lambda_c$ and $\Xi_c$ to determine branching fractions, as well as $CP$ asymmetries in singly Cabibbo-suppressed decays.
