Dark Sector Particle Searches at Accelerator Facilities*

The discovery of a new scalar boson in 2012 at the Large Hadron Collider, which behaves increasingly like the Standard Model Higgs particle, the discovery of the gravitational wave in 2015 and the discovery of the black hole in 2019 greatly advance our understanding of the nature of the universe.   While they help getting one step closer to the origin of the universe, there still are over 95% of the universe to understand.  Of these is the dark matter that make up about a quarter of the universe.   Dark matter from cosmogenic origin has been searched both directly and indirectly.  The direct searches, however, have hard bound I sensitivity at the low mass due to the intrinsic backgrounds, most importantly from the radioactive impurities in the detector active material.  Recent theoretical work and future precision neutrino experimental facilities present an opportunity to expand dark sector particle searches in accelerators, thanks to the unprecedented proton beam power and precision detection capabilities.  Many future nuclear rare isotope facilities either ready for operation or close to be completed also possess similar advantages in search of dark sector particles in different kinematic regime, providing synergistic opportunities.   In this talk, I will present various search potential for dark sector particles in future neutrino experimental facilities. I will also present a case study at a rare nuclear isotope facility, in particular the Axion-Like Particle and discuss the sensitivity reaches of the search and the challenges that must be overcome at such facilities.