2019/06/21 by M. T. Prim, Prim, Markus Tobias
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle Detector Development and Performance #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.1906.09337
openalex publication_date 2019/06/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The 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 8×1035 cm-2s-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, SuperKEKB has completed a commissioning run, achieved a peak luminosity of 5.5 × 1033 cm-2s-1, and Belle II recorded a data sample of about 0.5 fb-1. In this presentation we show first results from studying missing energy signatures, such as leptonic and semileptonic B meson decays based on this early Belle II data. We report first studies on re-measuring important standard candle processes, such as the abundant inclusive B→ X l ν and B→ D^*ℓν decays, and evaluate the performance of machine learning-based tagging algorithms. Furthermore, we 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.