Mario Merola

04 July 2018

Abstract: The Belle II experiment at the SuperKEKB collider is a major upgrade of the KEK "B factory" facility in Tsukuba, Japan. The machine is designed for an instantaneous luminosity of 8 $\times 10^{35}\mathrm{cm^{-2}s^{-1}}$, and the experiment is expected to accumulate a data sample of about 50 $\mathrm{ab^{-1}}$. With this amount of data, decays sensitive to physics beyond the Standard Model can be studied with unprecedented precision. One promising set of modes are physics processes with missing energy such as the semileptonic and leptonic B meson decays $B \rightarrow X_{u}\ell\nu$, $B \rightarrow D^{(\star)}\tau \nu$, and $B \rightarrow \ell \nu (\gamma)$, and the rare process $B \rightarrow K^{(*)} \nu\overline{\nu}$, which provides one of the cleanest experimental probes of the favour-changing neutral current process $b\rightarrow s \nu \overline{\nu}$. This report discusses the expected sensitivities of Belle II for these decays.