000001777 001__ 1777
000001777 005__ 20191106052658.0
000001777 037__ $$aBELLE2-CONF-PROC-2019-016
000001777 041__ $$aeng
000001777 100__ $$aC MacQueen
000001777 245__ $$aDark Sector Physics at Belle II
000001777 260__ $$a$$c2019-10-31
000001777 300__ $$a4
000001777 520__ $$aThe first dark sector physics analyses for Belle II are currently underway.  Belle II detects collisions at the SuperKEKB asymmetric-energy $e^{+}e^{-}$ collider in Tsukuba, Japan and has already collected $6.5$ fb$^{-1}$ of data at the $\Upsilon(4S)$ resonance ($\sqrt{s} = 10.58$ GeV).  The collider has a design luminosity of $8 \times 10^{35}$ cm$^{-2}$ s$^{-1}$ and the detector will collect $50$ ab$^{-1}$ of data in its lifetime, making it the most luminous experiment in the world.  In addition to early performance studies on particle identification, tracking quality, energy resolution, and more, Belle II is preparing to release its first physics results.  These include the first official time-integrated luminosity measurements, as well as searches for the dark photon, $A^{\prime}$, in a monophoton signature, and the invisible $Z^{\prime}$ in both $L_{\mu}-L_{\tau}$ and Lepton Flavour Violation models.  Even with this early data set, it is clear that Belle II is and will continue to be competitive in various dark sector searches at the MeV-GeV scale.
000001777 6531_ $$adark sector
000001777 6531_ $$adark matter
000001777 6531_ $$aALP
000001777 6531_ $$ainvisible Z'
000001777 6531_ $$adark Z'
000001777 6531_ $$asark photon
000001777 8560_ $$fcaitlin.macqueen@desy.de
000001777 8564_ $$uhttps://docs.belle2.org/record/1777/files/BELLE2-CONF-PROC-2019-016.pdf