Belle II

From 1998 to 2010, KEK, the Japanese High-Energy Accelerator Research Organisation, operated KEKB, a 3 km circumference asymmetric electron-positron collider thereby reaching the world record in instantaneous luminosity of 2.1x10³⁴ cm^–2/s. The beam energies were chosen so that in the collisions large numbers of B-anti-B meson pairs were produced, and hence the facility is also known as a B factory.
The SuperKEKB accelerator, a major upgrade of KEKB, is designed to achieve a peak luminosity a factor of forty times higher. The Belle II experiment is designed to record data at SuperKEKB, with a performance similar or better than Belle or BaBar, the B factory detectors, in a much more severe beam background environment.

The B-factory experiments observed the first large signals for CP violation (matter-antimatter asymmetries) in the B meson sector in 2001. These results demonstrated Kobayashi and Maskawa's hypothesis for the origin of the CP violation is correct and provided the experimental foundation for their 2008 Nobel Prize in Physics. Belle II, the first super B-Factory experiment, is designed to find NP (New Physics) beyond the Standard Model of particle physics.

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