Speaker
Description
The Belle II experiment, located at the SuperKEKB accelerator complex near Tokyo in Japan, has started
its 2019 run to collect collision events at large instantaneous luminosities. In this presentation we
show results from studying missing energy signatures, such as leptonic and semileptonic B meson decays:
We report studies on re-measuring important standard candle processes, such as abundant inclusive
$B \to X \ell \bar \nu_\ell$ and $B \to D^{(*)} \ell \bar \nu_\ell$ decays using tagged and untagged
approaches. In addition we establish the presence of charmless semileptonic decays at the endpoint of
the lepton momentum spectrum. We further discuss the potential of Belle II to study the present day
anomaly in ratios of charm semileptonic decays with tau-leptons to light leptons, known as $R(D)$ and
$R(D^*)$ in the literature, and other missing energy modes with future Belle II data.
