000001602 001__ 1602
000001602 005__ 20190808151222.0
000001602 037__ $$aBELLE2-POSTER-CONF-2019-006
000001602 041__ $$aeng
000001602 100__ $$aAndrea Fodor
000001602 245__ $$aSemileptonic and leptonic B decay results from early Belle II data
000001602 260__ $$aLepton Photon 2019$$c2019-08-08
000001602 300__ $$amult. p
000001602 520__ $$aThe Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. From February to July 2018, the machine has completed a commissioning run, achieved a peak luminosity of $5.5\times 10^{33}$ cm$^{-2}$s$^{-1}$, and Belle II has recorded a data sample of about 0.5 fb$^{-1}$. Main operation of SuperKEKB has started in March 2019. In this presentation we show first results from studying missing energy signatures, such as leptonic and semileptonic B meson decays based on early Belle II data. We report first studies on re-measuring important standard candle processes, such as the abundant inclusive $B\to X\ell\nu$ and $B\to D^*\ell\nu$ decays. Furthermore, we will also present an overview of the semileptonic B decays that will be measured in the upcoming years at Belle II and discuss prospects for important B-anomalies like R(D) and R(D*), as well as other tests of lepton flavor universality.
000001602 8560_ $$fandrea.fodor@desy.de
000001602 8564_ $$uhttps://docs.belle2.org/record/1602/files/BELLE2-POSTER-CONF-2019-006.pdf