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 first results from studying missing energy
signatures, such as leptonic and semileptonic B meson decays: We report first studies
on re-measuring important standard candle processes, such as abundant inclusive B to l X and B to D l decays, and evaluate the performance of our machine learning based
tagging algorithms. In addition, we plan to show first results on control regions and
sidebands relevant for re-establishing B to D and B decays with future Belle II data. 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, with future Belle II data and its potential to measure similar ratios with
other hadronic final states.
