000002063 001__ 2063
000002063 005__ 20200803115109.0
000002063 037__ $$aBELLE2-CONF-PROC-2020-012
000002063 041__ $$aeng
000002063 100__ $$aMichel Bertemes
000002063 245__ $$aDark Sector Searches at Belle II 
000002063 260__ $$a$$c2020-07-31
000002063 300__ $$amult. p
000002063 520__ $$aThe Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider  is a substantial upgrade of the B factory facility at the Japanese KEK laboratory.  The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and  the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more  than its predecessor. During 2018, the machine has completed a commissioning run,  recording a data sample of about 0.5 fb$^{-1}$. Main operations started in  March 2019 with the complete Belle II detector: an integrated luminosity  of ~60 fb$^{-1}$ has been collected so far. These early data sets,  with specifically designed low multiplicity triggers, offer already the  possibility to search for a large variety of dark sector particles in  the GeV mass range, complementary to LHC and to dedicated low energy experiments.  The talk will review the status of the dark sector searches at Belle II, with a focus  on the discovery potential of the early data, and show the first results.
000002063 8560_ $$fmichel.bertemes@desy.de
000002063 8564_ $$uhttps://docs.belle2.org/record/2063/files/EDSU2020_Proceedings-4.pdf