Apr 13 – 18, 2020
UZ Obergurgl
Europe/Zurich timezone

Semileptonic and missing energy decays at Belle II

Not scheduled
UZ Obergurgl

UZ Obergurgl

University Center Obergurgl Gaisbergweg 5 6456 Obergurgl Austria


Ida Peruzzi (Laboratori Nazionali di Frascati dell'INFN)


The 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 results from studying missing energy signatures, such as leptonic and semileptonic B meson decays:
We report studies on re-measuring important standard candle processes, such as abundant inclusive
$B \to X \ell \bar \nu_\ell$ and $B \to D^{(*)} \ell \bar \nu_\ell$ decays using tagged and untagged
approaches. In addition we establish the presence of charmless semileptonic decays at the endpoint of
the lepton momentum spectrum. 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, and other missing energy modes with future Belle II data.

Primary author

Ida Peruzzi (Laboratori Nazionali di Frascati dell'INFN)

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