Sumitted to PubDB: 2019-12-24

Category: Proceeding, Visibility: Public

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Authors	Andrea Fodor
Date	2019-10-29
Belle II Number	BELLE2-CONF-PROC-2019-018
Abstract	The Belle II experiment at the SuperKEKB energy-asymmetric $e^{+}{e}^{-}$ collider is a substantial upgrade of the B factory facility, Belle, 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. The main operation of SuperKEKB has started in March 2019, and collisions ran until July 2019, achieving a peak luminosity of $5.5\times {10}^{33}$ cm${}^{-2}$s${}^{-1}$. The results presented here were obtained from a subset of collected data of 0.41~fb${}^{-1}$. In the poster presented at the conference the first results from studying semileptonic $\mathit{\text{B}}$-meson decays were shown. The performance of the Full Event Interpretation (FEI) tagging was analysed. The $B^0\to D^{\ast -}{\ell }^{+}{\nu }_{\ell }$ mode was rediscovered, using the untagged approach.

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