000001467 001__ 1467
000001467 005__ 20190610091027.0
000001467 037__ $$aBELLE2-TALK-CONF-2019-062
000001467 041__ $$aeng
000001467 088__ $$aBELLE2-TALK-DRAFT-2019-056
000001467 100__ $$aLu Cao
000001467 245__ $$aSemileptonic and leptonic results from 2018 Belle II commissioning data
000001467 260__ $$aFlavor 2019$$c2019-05-21
000001467 300__ $$amult. p
000001467 500__ $$a25+5 min
000001467 520__ $$aThe 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.
000001467 8560_ $$fdoris.yangsoo.kim@desy.de
000001467 8564_ $$uhttps://docs.belle2.org/record/1467/files/BELLE2-TALK-CONF-2019-062.pdf