000000759 001__ 759
000000759 005__ 20180114133615.0
000000759 037__ $$aBELLE2-CONF-PROC-2018-003
000000759 041__ $$aeng
000000759 100__ $$aYinghui GUAN
000000759 245__ $$aStudies of missing energy decays at Belle II
000000759 260__ $$a$$c2018-01-14
000000759 300__ $$a6
000000759 520__ $$aThe 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 $8\times10^{35} \rm cm^{-2}s^{-1}$, and the experiment is expected to accumulate a data sample of about 50 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 $B^+  \rightarrow \tau^+ \nu$, $B \rightarrow D^{(*)} \tau \nu$, and $B  \rightarrow K^{(*)} \nu \bar{\nu}$ decays. The $B \rightarrow K^{(*)} \nu \bar{\nu}$ decay provides one of the cleanest experimental probes of the flavour-changing neutral current process $b \rightarrow s \nu \bar{\nu}$, which is sensitive to physics beyond the Standard Model. However, the missing energies of the neutrinos in the final state makes the measurement challenging and requires full reconstruction of the spectator $B$ meson in $e^+ e^-  \rightarrow  \Upsilon(4S) \rightarrow B\bar{B}$ events.   This report discusses the expected sensitivities of Belle II for these rare decays.
000000759 8560_ $$fyinghui.guan@desy.de
000000759 8564_ $$uhttps://docs.belle2.org/record/759/files/BELLE2-CONF-PROC-2018-003.pdf