000000709 001__ 709
000000709 005__ 20171008063308.0
000000709 037__ $$aBELLE2-TALK-CONF-2017-093
000000709 041__ $$aeng
000000709 088__ $$aBELLE2-TALK-DRAFT-2017-044
000000709 100__ $$aYinghui GUAN
000000709 245__ $$aStudies of missing energy decays at Belle II
000000709 260__ $$aPANIC2017$$c2017-09-01
000000709 300__ $$amult. p
000000709 500__ $$a15+5 min
000000709 520__ $$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 8x10^35 cm^-2s^-1, and the experiment is expected to accumulate a data sample of about 50 ab^-1 in five years of running. 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^+ to tau^+ nu, B to D^(*) tau nu, and B to K^(*) nu nu-bar decays. The B--> K^(*) nu nu-bar decay provides one of the cleanest experimental probes of the flavour-changing neutral current process b-->s nu nu-bar, which is sensitive to physics beyond the Standard Model. However, the missing energies of the two neutrinos in the final state makes the measurement challenging and requires full reconstruction of the spectator B meson in e^+ e^---> Upsilon(4S)--> BBbar events. Observation of the B--> K^(*) nu nu-bar decay will become possible with the large data set to be collected by the upgraded Belle II experiment running at the Super-KEKB accelerator in Japan. A challenge of this analysis will be understanding and suppressing backgrounds. This talk discusses such backgrounds and the expected sensitivity of Belle II for this rare decay.
000000709 6531_ $$aMissing energy
000000709 6531_ $$aRare decay 
000000709 8560_ $$fdoris.yangsoo.kim@desy.de
000000709 8564_ $$uhttps://docs.belle2.org/record/709/files/BELLE2-TALK-CONF-2017-093.pdf