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Volume 332 - XIV International Conference on Heavy Quarks and Leptons (HQL2018) - CKM Matrix and Semileptonic Decays
Semileptonic B-Meson decays at Belle II
J.F. Krohn* On behalf of the BELLE II collaboration
*corresponding author
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Pre-published on: 2018 December 05
Published on: 2018 December 11
The Belle II experiment is the upgrade of the Belle experiment, performed at the SuperKEKB asymmetric electron-positron-collider, located in Tsukuba, Japan. With an design instantaneous luminosity of $8\cdot 10^{35}\rm{cm}^{-2}\rm{s}^{-1}$ a dataset of $50\ \rm{ab}^{-1}$ will be collected. The clean collision environment of the experiment and the large dataset yields the ability to perform high precision measurements of physics mediated by the weak force, such as semileptonic $B$-meson decays. Of special focus of this document are magnitudes of the CKM matrix elements $\rm{V_{\rm{ub}}}$ and $\rm{V_{\rm{cb}}}$ measured in $B\to D^{(\star)} l \nu$ and $B\to \pi l \nu$, where $l = e,\mu$, as well as the ratio of the branching fractions, $R_{D^{(\star)}} := \mathcal{B} (B\to D^{(\star)} \mu \nu) / \mathcal{B} (B\to D^{(\star)} e \nu) $ and $R_{\tau} := \mathcal{B} (B\to D^{(\star)} \tau\nu) / \mathcal{B} (B\to D^{(\star)} l \nu) $ , of lepton couplings in these decays. Some of these have shown persistent tension with the Standard Model and are therefore of primary interest towards a better understanding of the weak force carriers and potential new physics couplings.
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