000002205 001__ 2205
000002205 005__ 20210129093122.0
000002205 037__ $$aBELLE2-CONF-PROC-2021-003
000002205 041__ $$aeng
000002205 100__ $$aMarcello Campajola
000002205 245__ $$aDark Sector first results at Belle II
000002205 260__ $$a$$c2021-01-25
000002205 300__ $$amult. p
000002205 520__ $$aUnderstanding the nature of dark matter is one of the most exciting challenges in fundamental physics nowadays, requiring the synergy of different search techniques, as well as theoretical inputs. An interesting direction for the investigation of dark matter is the one offered by the \textit{B}-factories. Belle II experiment at the SuperKEKB energy-asymmetric  $e^+e^-$ collider is a substantial upgrade of the \textit{B}-factory facility at the Japanese KEK laboratory. With a machine design luminosity of $6\times10^{35}\,\rm{cm}^{-2}s^{-1}$, the Belle II experiment aims to record 50 ab$^{-1}$ of data: a factor of 50 more than its predecessor. Thanks to this large data-sample and by using dedicated triggers the Belle II experiment is expected to explore dark sector candidates with an unprecedented sensitivity in a mass range up to 10 GeV$/c^2$. During 2018, the machine has completed a commissioning run, recording a data-sample corresponding to an integrated luminosity of about 0.5 fb$^{-1}$, while main operations started on March 2019 with an almost complete detector. An integrated luminosity of $\sim 90\, \rm{fb}^{-1}$ has been collected so far.  These early data sets offer already the possibility to search for a large variety of dark sector particles in the GeV mass range. This paper  reviews the status of the dark-sector searches at Belle II, with a focus on the first obtained results, and the discovery potential with the  data-set available in the short term.
000002205 6531_ $$aLow-mass Dark Matter, Dark Sector, Dark Photon, Axion-Like Particles, Belle II, \textit{B}--factories
000002205 8560_ $$fmarcello.campajola@desy.de
000002205 8564_ $$uhttps://docs.belle2.org/record/2205/files/Campajola_ICNFP_Dark_Sector_first_results_at_Belle_II.pdf
000002205 8564_ $$uhttps://docs.belle2.org/record/2205/files/Marked%20up%20copy%20from%20Jim.pdf