Semileptonic and leptonic results from 2018 Belle II commissioning data

Sumitted to PubDB: 2019-06-10

Category: Talk, Visibility: Public

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Authors	Lu Cao
Date	May 21, 2019
Belle II Number	BELLE2-TALK-CONF-2019-062
Abstract	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.
Conference	Flavor 2019