Prof. Dr. Youngjoon Kwon (Yonsei U, Korea): Searching for dark sector with the most luminous collider

Many astrophysical evidences point us to dark matter and dark energy, but nothing has been known about the identity and physical properties of the particles that constitute the dark matter. There have been models suggested for dark sector in which several dark-matter particles interact on their own without much influence on the known particles in the Standard Model of elementary particle physics.
The Belle and Belle II experiments have been devised and constructed mainly to study the matter-antimatter asymmetry in the Universe by analyzing the B-mesons and other heavy-flavor particles which are produced in the electron-positron collision, using the colliders KEKB (1999-2010) and SuperKEKB (2019-now) at KEK (High-Eerngy Accelerator Research Organization) in Tsukuba, Japan. The KEKB collider set world record for luminosity during its operation, which has been replaced by a new world record achieved by SuperKEK.
Using the highest-luminosity colliders, physicists of Belle and Belle II experiments have searched for dark-sector particles and phenomena. In this talk, we show recent results on dark-sector physics from Belle II and Belle, and discuss the prospects.
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